indefatigable
UK: ˌɪn.dɪˈfæt.ɪ.ɡə.bəl | US: ˌɪn.dɪˈfæt̬.ɪ.ɡə.bəl
Definition
adj. incapable of being tired out; not yielding to fatigue; untiring
Structure
in <not>de <completely>fatigable <weary>
Etymology
The word "indefatigable" originates from Latin indefatigabilis, combining:
- in- (negative prefix, "not")
- de- (intensifying prefix, "completely")
- fatigare ("to weary") + -abilis (suffix forming adjectives meaning "able to be").
The morpheme "fatigable" survives in Modern English (though rarely used alone), preserving the Latin root fatigare. The word’s evolution reflects a logical progression: "not able to be wearied" → "untiring." Its structure emphasizes persistence, often applied to relentless effort or energy.
Examples
She was an indefatigable advocate for human rights.
His indefatigable enthusiasm inspired the entire team.
The explorer’s indefatigable spirit led him to cross the desert alone.
Despite her age, she remained indefatigable in her pursuit of knowledge.
The volunteers worked with indefatigable dedication during the crisis.