untiring.
Not able to be tired; inexhaustible, tireless.
Meaning & usage
Not able to be tired; inexhaustible, tireless.
Resolute, unfailing.
Where this word comes from
Etymology tree Proto-Indo-European *né Proto-Indo-European *n̥- Proto-Germanic *un- Proto-West Germanic *un- Old English un- Middle English un- English un- English tiring English untiring From un- (prefix meaning ‘not’) + tiring (“that tire or tires”, adjective).
present participle and gerund of untire
Where this word comes from
Etymology tree Proto-Indo-European *h₂ent- Proto-Indo-European *-s Proto-Indo-European *h₂éntsder. Proto-Germanic *anda- Proto-West Germanic *anda- Old English and- Old English on- Middle English on- English un- Proto-West Germanic *teuʀōn Old English tēorian Middle English tiren English tire English untire Proto-Indo-European *-onts Proto-Germanic *-ndz Proto-West Germanic *-andī Old English -ende Middle English -ynge English -ing English untiring From untire (verb) + -ing (suffix forming present participles of verbs).
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.