Not easy to do, achieve, or master

• 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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• laborious

  1. Marked by or requiring long, hard work:
  2. Hard-working; industrious.

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  1. Marked by or requiring long, hard work:
  2. Hard-working; industrious.

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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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Rising

• climbing

  1. (uncountable) The sport of climbing, ascending a wall or a rock or another object using available holds, generally with the safety of a rope and belayer.
  2. (countable) Climb; ascent.
  3. Present participle of climb.

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  1. (uncountable) The sport of climbing, ascending a wall or a rock or another object using available holds, generally with the safety of a rope and belayer.
  2. (countable) Climb; ascent.
  3. Present participle of climb.

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• ascending

  1. Moving, going, or growing upward:
  2. Moving or progressing toward a higher level or degree:
  3. Growing or directing upward from a curved or slanted base, as certain plant stems.

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  1. Moving, going, or growing upward:
  2. Moving or progressing toward a higher level or degree:
  3. Growing or directing upward from a curved or slanted base, as certain plant stems.

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• skyward

  1. At or toward the sky.

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  1. At or toward the sky.

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• toward the crest

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• toward the summit

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• upward

  1. In, to, or toward a higher place, level, or position:
  2. Toward a higher position in a hierarchy or on a socioeconomic scale:
  3. Toward the head or upper parts:

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  1. In, to, or toward a higher place, level, or position:
  2. Toward a higher position in a hierarchy or on a socioeconomic scale:
  3. Toward the head or upper parts:

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• up

  1. In or to a higher position:
  2. In a direction opposite to the center of the earth or a comparable gravitational center:
  3. In or to an upright position:

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  1. In or to a higher position:
  2. In a direction opposite to the center of the earth or a comparable gravitational center:
  3. In or to an upright position:

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Laborious

• with-difficulty

  1. To be difficult an action to perform.

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  1. To be difficult an action to perform.

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• strenuous

  1. Requiring great effort, energy, or exertion:
  2. Vigorously active; energetic or zealous:

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  1. Requiring great effort, energy, or exertion:
  2. Vigorously active; energetic or zealous:

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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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