Tireless

adj

adj ·3 syllables ·Moderate ·College level

Definitions

Adjective
  1. 1
    Indefatigable, untiring and not yielding to fatigue not-comparable

    "James Milner's angled free-kick was headed on to the post by the tireless Bent and Lampard the opportunist was perfectly placed to stoop and head in from virtually on the goal-line."

  2. 2
    Without a tire (wheel covering); tyreless. US, not-comparable
Adjective
  1. 1
    characterized by hard work and perseverance wordnet
  2. 2
    showing sustained enthusiastic action with unflagging vitality wordnet

Synonyms

All synonyms
hardworkingindefatigableuntiringactiveardentassiduous

Example

More examples

"It was your tireless efforts and devotion that made the event successful."

Etymology

Etymology 1

From tire (“to become sleepy or weary”) + -less

Etymology 2

From tire + -less.

More for "tireless"

SynonymsSentencesPronunciationTranslate

Next best steps

Find stronger synonymsSee usage examplesCheck pronunciationBrowse writing guides

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.