different between undefatigable vs indefatigable

English

Etymology

un- +? defatigable

Adjective

undefatigable (comparative more undefatigable, superlative most undefatigable)

1. Obsolete form of indefatigable.
   • 1625-1629, Abraham Darcie/Darcy and Thomas Browne (translators), The History of the Most Renowned and Victorious Princess Elizabeth, Late Queen of England (originally by William Camden)

     undefatigable pains

English

Etymology

From Middle French, from Latin ind?fat?g?bilis (“untiring”), from in- (“not”) + d?fat?g? (“to tire out”).

Pronunciation

• (Received Pronunciation) IPA^(key): /??nd??fæt???bl/
• (General American) IPA^(key): /??nd??fæt???b?l/, [??nd??fæ????b?l]
• (sometimes proscribed) IPA^(key): /??nd?f??ti??b?l/
• Hyphenation: in?de?fa?tig?a?ble

Adjective

indefatigable (comparative more indefatigable, superlative most indefatigable)

1. Extremely persistent and untiring.

   Synonyms: inexhaustible, relentless, tireless, unflagging, unsinkable, untiring, unwearying

   Antonym: (much less common) defatigable

Derived terms

Translations