Requiring great or extreme bodily, mental, or spiritual strength

• weighty

  1. Having considerable weight; heavy.
  2. Burdensome; oppressive:
  3. Of great consequence; serious or momentous:

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  1. Having considerable weight; heavy.
  2. Burdensome; oppressive:
  3. Of great consequence; serious or momentous:

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• trying

  1. Causing strain, hardship, or distress.

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  1. Causing strain, hardship, or distress.

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• tough

  1. Able to withstand great strain without tearing or breaking; strong and resilient:
  2. Hard to cut or chew:
  3. Physically hardy; rugged:

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  1. Able to withstand great strain without tearing or breaking; strong and resilient:
  2. Hard to cut or chew:
  3. Physically hardy; rugged:

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• taxing

  1. Burdensome; wearing:

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  1. Burdensome; wearing:

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• severe

  1. Unsparing, harsh, or strict, as in treatment of others:
  2. Marked by or requiring strict adherence to rigorous standards or high principles:
  3. Stern or forbidding, as in manner or appearance:

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  1. Unsparing, harsh, or strict, as in treatment of others:
  2. Marked by or requiring strict adherence to rigorous standards or high principles:
  3. Stern or forbidding, as in manner or appearance:

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• rough

  1. Having a surface marked by irregularities, protuberances, or ridges; not smooth:
  2. Coarse or shaggy to the touch:
  3. Difficult to travel over or through:

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  1. Having a surface marked by irregularities, protuberances, or ridges; not smooth:
  2. Coarse or shaggy to the touch:
  3. Difficult to travel over or through:

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• rigorous

  1. Characterized by or adhering to strict standards or methods; exacting and thorough:
  2. Harsh, severe, or demanding:
  3. Very unpleasant or inclement:

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  1. Characterized by or adhering to strict standards or methods; exacting and thorough:
  2. Harsh, severe, or demanding:
  3. Very unpleasant or inclement:

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• oppressive

  1. Exercising power arbitrarily and often unjustly; tyrannical.
  2. Difficult to cope with; causing hardship or depressed spirits:
  3. Hot and humid; sweltering:

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  1. Exercising power arbitrarily and often unjustly; tyrannical.
  2. Difficult to cope with; causing hardship or depressed spirits:
  3. Hot and humid; sweltering:

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• onerous

  1. Troublesome or oppressive; burdensome.
  2. Entailing more liabilities than benefits or imposing significant obligations.

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  1. Troublesome or oppressive; burdensome.
  2. Entailing more liabilities than benefits or imposing significant obligations.

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• heavy

  1. Having relatively great weight:
  2. Having relatively high density; having a high specific gravity.
  3. Large, as in number or quantity:

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  1. Having relatively great weight:
  2. Having relatively high density; having a high specific gravity.
  3. Large, as in number or quantity:

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• hard

  1. Resistant to pressure; not readily penetrated; firm or solid:
  2. Well protected from an attack, as by aerial bombardment:
  3. Requiring great effort or endurance:

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  1. Resistant to pressure; not readily penetrated; firm or solid:
  2. Well protected from an attack, as by aerial bombardment:
  3. Requiring great effort or endurance:

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• formidable

  1. Arousing fear, dread, or alarm:
  2. Inspiring awe, admiration, or wonder:
  3. Difficult to undertake, surmount, or defeat:

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  1. Arousing fear, dread, or alarm:
  2. Inspiring awe, admiration, or wonder:
  3. Difficult to undertake, surmount, or defeat:

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• exigent

  1. Requiring immediate action; pressing:
  2. Having or making urgent demands; demanding:

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  1. Requiring immediate action; pressing:
  2. Having or making urgent demands; demanding:

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• exacting

  1. Making severe demands; rigorous:
  2. Requiring great care, effort, or attention:

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  1. Making severe demands; rigorous:
  2. Requiring great care, effort, or attention:

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• effortful

  1. Requiring or showing effort.

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  1. Requiring or showing effort.

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• difficult

  1. Requiring considerable effort or skill; not easy to do or accomplish:
  2. Not easy to endure; full of hardship or trouble; trying:
  3. Not easy to comprehend, solve, or explain:

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  1. Requiring considerable effort or skill; not easy to do or accomplish:
  2. Not easy to endure; full of hardship or trouble; trying:
  3. Not easy to comprehend, solve, or explain:

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• demanding

  1. Requiring much effort or attention:
  2. Requiring others to work hard or meet high expectations:

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  1. Requiring much effort or attention:
  2. Requiring others to work hard or meet high expectations:

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• burdensome

  1. Weighing much or hard to carry; heavy.
  2. Causing hardship or distress.

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  1. Weighing much or hard to carry; heavy.
  2. Causing hardship or distress.

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• backbreaking

  1. Demanding great exertion; arduous and exhausting.

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  1. Demanding great exertion; arduous and exhausting.

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• arduous

  1. Demanding great effort or labor; difficult:
  2. Testing severely the powers of endurance; strenuous:
  3. Hard to traverse, climb, or surmount.

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  1. Demanding great effort or labor; difficult:
  2. Testing severely the powers of endurance; strenuous:
  3. Hard to traverse, climb, or surmount.

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Not easy to do, achieve, or master

• uphill

  1. Located on high or higher ground:
  2. Going up a hill or slope:
  3. Marked by difficulty or strong resistance; laborious:

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  1. Located on high or higher ground:
  2. Going up a hill or slope:
  3. Marked by difficulty or strong resistance; laborious:

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• tough

  1. Able to withstand great strain without tearing or breaking; strong and resilient:
  2. Hard to cut or chew:
  3. Physically hardy; rugged:

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  1. Able to withstand great strain without tearing or breaking; strong and resilient:
  2. Hard to cut or chew:
  3. Physically hardy; rugged:

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• tall

  1. Having greater than ordinary height:
  2. Having considerable height, especially in relation to width; lofty:
  3. Having a specified height:

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  1. Having greater than ordinary height:
  2. Having considerable height, especially in relation to width; lofty:
  3. Having a specified height:

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• serious

  1. Careful in thought, full of concern, or restrained and dignified in manner; somber or grave:
  2. Requiring or carried out with careful thought or concern:
  3. Intended for sophisticated people.

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  1. Careful in thought, full of concern, or restrained and dignified in manner; somber or grave:
  2. Requiring or carried out with careful thought or concern:
  3. Intended for sophisticated people.

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• hard

  1. Resistant to pressure; not readily penetrated; firm or solid:
  2. Well protected from an attack, as by aerial bombardment:
  3. Requiring great effort or endurance:

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  1. Resistant to pressure; not readily penetrated; firm or solid:
  2. Well protected from an attack, as by aerial bombardment:
  3. Requiring great effort or endurance:

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• difficult

  1. Requiring considerable effort or skill; not easy to do or accomplish:
  2. Not easy to endure; full of hardship or trouble; trying:
  3. Not easy to comprehend, solve, or explain:

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  1. Requiring considerable effort or skill; not easy to do or accomplish:
  2. Not easy to endure; full of hardship or trouble; trying:
  3. Not easy to comprehend, solve, or explain:

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• arduous

  1. Demanding great effort or labor; difficult:
  2. Testing severely the powers of endurance; strenuous:
  3. Hard to traverse, climb, or surmount.

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  1. Demanding great effort or labor; difficult:
  2. Testing severely the powers of endurance; strenuous:
  3. Hard to traverse, climb, or surmount.

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Difficult

• stiff

  1. Difficult to bend or fold:
  2. Not moving or operating easily or freely; resistant:
  3. Lacking ease or comfort of movement; not limber:

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  1. Difficult to bend or fold:
  2. Not moving or operating easily or freely; resistant:
  3. Lacking ease or comfort of movement; not limber:

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• hard

  1. Resistant to pressure; not readily penetrated; firm or solid:
  2. Well protected from an attack, as by aerial bombardment:
  3. Requiring great effort or endurance:

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  1. Resistant to pressure; not readily penetrated; firm or solid:
  2. Well protected from an attack, as by aerial bombardment:
  3. Requiring great effort or endurance:

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• arduous

  1. Demanding great effort or labor; difficult:
  2. Testing severely the powers of endurance; strenuous:
  3. Hard to traverse, climb, or surmount.

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  1. Demanding great effort or labor; difficult:
  2. Testing severely the powers of endurance; strenuous:
  3. Hard to traverse, climb, or surmount.

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Industrious

• diligent

  1. Marked by persevering, painstaking effort.

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  1. Marked by persevering, painstaking effort.

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• indefatigable

  1. Having or showing a capacity for persistent effort; not tiring or relenting:

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  1. Having or showing a capacity for persistent effort; not tiring or relenting:

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• assiduous

  1. Showing or characterized by persistent attention or untiring application:

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  1. Showing or characterized by persistent attention or untiring application:

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