indefatigable

[ in-di-fat-i-guh-buhl ]
/ ˌɪn dɪˈfæt ɪ gə bəl /
SEE SYNONYMS FOR indefatigable ON THESAURUS.COM

adjective

incapable of being tired out; not yielding to fatigue; untiring.

Origin of indefatigable

1580–90; < Latin indēfatīgābilis untiring, equivalent to in- in-3 + dēfatīgā(re) to tire out (see de-, fatigue) + -bilis -ble

OTHER WORDS FROM indefatigable

in·de·fat·i·ga·bil·i·ty, in·de·fat·i·ga·ble·ness, noun in·de·fat·i·ga·bly, adverb

Words nearby indefatigable

indecomposable, indecorous, indecorum, indeed, indef., indefatigable, indefeasible, indefectible, indefensible, indefinable, indefinite

Words related to indefatigability

spunk, moxie, grit, endurance, stamina, determination, tenacity, dedication, steadfastness, persistence, energy, vitality, fortitude, resilience, perseverance, continuance, constancy, backbone, pertinacity, guts

Example sentences from the Web for indefatigability

British Dictionary definitions for indefatigability

indefatigable
/ (ˌɪndɪˈfætɪɡəbəl) /

adjective

unable to be tired out; unflagging

Derived forms of indefatigable

indefatigability or indefatigableness, noun indefatigably, adverb

Word Origin for indefatigable

C16: from Latin indēfatīgābilis, from in- 1 + dēfatīgāre, from fatīgāre to tire