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Implacable vs Indefatigable - What's the difference?

implacable | indefatigable |

As adjectives the difference between implacable and indefatigable

is that implacable is unplaceable; that cannot be put or placed while indefatigable is extremely persistent and untiring.

implacable

English

Adjective

(en adjective)
  • Not able to be placated or appeased.
  • Adamant; immovable.

    • indefatigable

    English

    Adjective

    (en adjective)
  • Extremely persistent and untiring.
  • *
    • but he was at the same time an excellent scholar, and most indefatigable in teaching the two lads.
  • * 1898 , :
    • All night long the Martians were hammering and stirring, sleepless, indefatigable , at work upon the machines they were making ready, and ever and again a puff of greenish-white smoke whirled up to the starlit sky.

    Synonyms

    * inexhaustible, tireless, unflagging, unsinkable, untiring, unwearying,

    Antonyms

    * defatigable (much less common)

    Derived terms

    * indefatigably * indefatigability * indefatigableness