Usually means: Cannot be tired; always energetic.
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We found 8 dictionaries that define the word undefatigable:

General (8 matching dictionaries)
  1. undefatigable: Wordnik
  2. undefatigable: Wiktionary
  3. Undefatigable: Dictionary.com
  4. Undefatigable: Online Plain Text English Dictionary
  5. undefatigable: Webster's Revised Unabridged, 1913 Edition
  6. Undefatigable: AllWords.com Multi-Lingual Dictionary
  7. undefatigable: FreeDictionary.org
  8. Undefatigable: TheFreeDictionary.com

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Definitions from Wiktionary (Undefatigable)

▸ adjective:  Obsolete form of indefatigable. [Extremely persistent and untiring.]

Similar:
untyreable, indomable, undefeasible, unhabile, indefeisible, inavailable, unvulnerable, unpatient, unfallible, unevitable, more...

▸ Words similar to undefatigable

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▸ Popular nouns described by undefatigable

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▸ Rhymes of undefatigable

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Similar:
untyreable, indomable, undefeasible, unhabile, indefeisible, inavailable, unvulnerable, unpatient, unfallible, unevitable, more...



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