Firmly, often unreasonably immovable in purpose or will

• unyielding

  1. Not giving way to pressure; hard or inflexible:
  2. Incapable of being changed; unalterable:
  3. Not willing to change or be persuaded; resolute:

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  1. Not giving way to pressure; hard or inflexible:
  2. Incapable of being changed; unalterable:
  3. Not willing to change or be persuaded; resolute:

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• unrelenting

  1. Having or exhibiting uncompromising determination; unyielding:
  2. Not diminishing in intensity, pace, or effort:

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  1. Having or exhibiting uncompromising determination; unyielding:
  2. Not diminishing in intensity, pace, or effort:

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• uncompromising

  1. Unwilling to grant concessions or negotiate; inflexible:

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  1. Unwilling to grant concessions or negotiate; inflexible:

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• uncompliant

  1. (archaic) incompliant

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  1. (archaic) incompliant

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• unbending

  1. Not yielding; inflexible:
  2. Aloof and often antisocial; extremely reserved:

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  1. Not yielding; inflexible:
  2. Aloof and often antisocial; extremely reserved:

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• unbendable

  1. not bendable

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  1. not bendable

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• rigid

  1. Not flexible or pliant; stiff:
  2. Not moving or flexing:
  3. Not changing or adjusting to different conditions or problems:

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  1. Not flexible or pliant; stiff:
  2. Not moving or flexing:
  3. Not changing or adjusting to different conditions or problems:

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• remorseless

  1. Having no pity or compassion; merciless.
  2. Unyielding; relentless.

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  1. Having no pity or compassion; merciless.
  2. Unyielding; relentless.

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• relentless

  1. Unyielding in severity or strictness; unrelenting:
  2. Steady and persistent; unremitting:

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  1. Unyielding in severity or strictness; unrelenting:
  2. Steady and persistent; unremitting:

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• obdurate

  1. Not changing in response to argument or other influence; obstinate or intractable:
  2. Hardened in wrongdoing or wickedness; stubbornly impenitent:
  3. Hardened against feeling; hardhearted:

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  1. Not changing in response to argument or other influence; obstinate or intractable:
  2. Hardened in wrongdoing or wickedness; stubbornly impenitent:
  3. Hardened against feeling; hardhearted:

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• iron

  1. A silvery-white, lustrous, malleable, ductile, magnetic or magnetizable, metallic element occurring abundantly in combined forms, notably in hematite, limonite, magnetite, and taconite, and used alloyed in a wide range of important structural materials. Atomic number 26; atomic weight 55.845; melting point 1,538°C; boiling point 2,861°C; specific gravity 7.874 (at 20°C); valence 2, 3, 4, 6.
  2. An implement made of iron alloy or similar metal, especially a bar heated for use in branding, curling hair, or cauterizing.
  3. Great hardness or strength; firmness:

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  1. A silvery-white, lustrous, malleable, ductile, magnetic or magnetizable, metallic element occurring abundantly in combined forms, notably in hematite, limonite, magnetite, and taconite, and used alloyed in a wide range of important structural materials. Atomic number 26; atomic weight 55.845; melting point 1,538°C; boiling point 2,861°C; specific gravity 7.874 (at 20°C); valence 2, 3, 4, 6.
  2. An implement made of iron alloy or similar metal, especially a bar heated for use in branding, curling hair, or cauterizing.
  3. Great hardness or strength; firmness:

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• intransigent

  1. Refusing to moderate a position, especially an extreme position; uncompromising.

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  1. Refusing to moderate a position, especially an extreme position; uncompromising.

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• inflexible

  1. Not easily bent; stiff or rigid.
  2. Incapable of being changed; unalterable:
  3. Refusing to change one's attitude, purpose, or principles; immovable:

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  1. Not easily bent; stiff or rigid.
  2. Incapable of being changed; unalterable:
  3. Refusing to change one's attitude, purpose, or principles; immovable:

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• inexorable

  1. Impossible to stop, alter, or resist; inevitable:
  2. Not capable of being persuaded by entreaty; relentless:

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  1. Impossible to stop, alter, or resist; inevitable:
  2. Not capable of being persuaded by entreaty; relentless:

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• incompliant

  1. Not willing to comply.

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  1. Not willing to comply.

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• implacable

  1. Impossible to placate or appease:

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  1. Impossible to placate or appease:

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• grim

  1. Discouraging or depressing:
  2. Dismal; gloomy:
  3. Stern or forbidding:

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  1. Discouraging or depressing:
  2. Dismal; gloomy:
  3. Stern or forbidding:

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• die-hard

  1. Stubbornly resisting change or clinging to a seemingly hopeless or outdated cause.
  2. One who stubbornly resists change or tenaciously adheres to a seemingly hopeless or outdated cause:

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  1. Stubbornly resisting change or clinging to a seemingly hopeless or outdated cause.
  2. One who stubbornly resists change or tenaciously adheres to a seemingly hopeless or outdated cause:

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• brassbound

  1. Banded or trimmed with brass or a similar metal, such as bronze.
  2. Inflexible; rigid:
  3. Bold and impudent; brazen.

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  1. Banded or trimmed with brass or a similar metal, such as bronze.
  2. Inflexible; rigid:
  3. Bold and impudent; brazen.

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• adamantine

  1. Made of or resembling adamant.
  2. Having the hardness or luster of a diamond.
  3. Unyielding; inflexible:

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  1. Made of or resembling adamant.
  2. Having the hardness or luster of a diamond.
  3. Unyielding; inflexible:

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• adamant

  1. Not willing to change one's opinion, purpose, or principles; unyielding.
  2. A stone once believed to be impenetrable in its hardness.
  3. An extremely hard substance.

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  1. Not willing to change one's opinion, purpose, or principles; unyielding.
  2. A stone once believed to be impenetrable in its hardness.
  3. An extremely hard substance.

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Difficult to alleviate or cure

• pertinacious

  1. Holding tenaciously or stubbornly to a purpose, opinion, or course of action:
  2. Extremely persistent or unyielding:

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  1. Holding tenaciously or stubbornly to a purpose, opinion, or course of action:
  2. Extremely persistent or unyielding:

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• persistent

  1. Refusing to give up or let go; persevering obstinately.
  2. Insistently repetitive or continuous:
  3. Existing or remaining in the same state for an indefinitely long time; enduring:

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  1. Refusing to give up or let go; persevering obstinately.
  2. Insistently repetitive or continuous:
  3. Existing or remaining in the same state for an indefinitely long time; enduring:

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• obstinate

  1. Stubbornly adhering to an attitude, opinion, or course of action; obdurate.
  2. Characterized by such adherence:
  3. Difficult to manage, control, or treat:

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  1. Stubbornly adhering to an attitude, opinion, or course of action; obdurate.
  2. Characterized by such adherence:
  3. Difficult to manage, control, or treat:

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