Standard Lemma guide

tireless

adj · 4 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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  • Southern-England: Recorded audio is listed in the source snapshot.
  • CMU ARPABET: T AY1 ER0 L AH0 S Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

adj

Meaning 1

Indefatigable, untiring and not yielding to fatigue

Definition source: English Wiktionary via Wiktextract

Usage: not-comparable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

adj

Meaning 2

Without a tire (wheel covering); tyreless.

Definition source: English Wiktionary via Wiktextract

Usage: US, not-comparable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

adjective satellite

Meaning 3

characterized by hard work and perseverance

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: hardworking, industrious, untiring

Antonyms: none provided

4

adjective satellite

Meaning 4

showing sustained enthusiastic action with unflagging vitality

Definition source: Princeton WordNet 3.0

Examples

  • an indefatigable advocate of equal rights
  • a tireless worker
  • unflagging pursuit of excellence

Meaning relationships

Synonyms: indefatigable, unflagging, unwearying

Antonyms: none provided

History

Etymology

Etymology tree English tire Proto-Indo-European *lewh1- Proto-Indo-European *lewHs-der. Proto-Germanic *leusaną Proto-Germanic *lausaz Proto-Germanic *-lausaz Proto-West Germanic *-laus Old English -lēas Middle English -les English -less English tireless From tire (“to become sleepy or weary”) + -less.

Etymology tree English tire Proto-Indo-European *lewh1- Proto-Indo-European *lewHs-der. Proto-Germanic *leusaną Proto-Germanic *lausaz Proto-Germanic *-lausaz Proto-West Germanic *-laus Old English -lēas Middle English -les English -less English tireless From tire + -less.

Across languages

Translations

32 source translations are retained for this English entry.

  • Armenian: անդուլ (andul) — indefatigable
  • Azerbaijani: yorulmaz — indefatigable
  • Bulgarian: неуморен (neumoren) — indefatigable
  • Catalan: incansable — indefatigable
  • Chinese Mandarin: 不倦 (bùjuàn) — indefatigable
  • Chinese Mandarin: 不知疲倦的 (bùzhī píjuàn de) — indefatigable
  • Dutch: onvermoeibaar — indefatigable
  • Esperanto: nelacigebla — indefatigable
  • Finnish: väsymätön — indefatigable
  • Finnish: uupumaton — indefatigable
  • French: inlassable — indefatigable
  • Galician: incansable — indefatigable
  • Galician: incansábel — indefatigable
  • German: unermüdlich — indefatigable
  • Greek: ακούραστος (akoúrastos) — indefatigable
  • Ancient Greek: ἀκάματος (akámatos) — indefatigable
  • Italian: instancabile — indefatigable
  • Japanese: 疲れを知らない (tsukare o shiranai) — indefatigable
  • Macedonian: неу́морен (neúmoren) — indefatigable
  • Macedonian: безу́морен (bezúmoren) — indefatigable
  • Polish: niestrudzony — indefatigable
  • Polish: niezmordowany — indefatigable
  • Portuguese: incansável — indefatigable
  • Russian: неутоми́мый (neutomímyj) — indefatigable
  • Russian: неуста́нный (neustánnyj) — indefatigable
  • Russian: безуста́нный (bezustánnyj) — indefatigable
  • Sanskrit: अरमति (aramati) — indefatigable
  • Spanish: incansable — indefatigable
  • Spanish: infatigable — indefatigable
  • Tocharian B: ekwalatte — indefatigable
  • Turkish: yorulmak bilmeyen — indefatigable
  • Ukrainian: невто́мний (nevtómnyj) — indefatigable