undefatigable

English

Etymology

From 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

References

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