# tirelessly

/ˈtaɪɹɫəsɫi/ (US) · /tˈaɪələsli/ (UK) · CEFR B2 · Adverb

Source: https://englishreference.com/word/tirelessly
Updated: 2026-05-09

## Definition

working very hard for a long time without stopping or getting tired.

For teachers: with great effort and persistence; in a manner that shows no signs of fatigue or loss of energy.

## Examples

- She worked tirelessly to finish the report on time.
- The rescue teams worked tirelessly through the night to find survivors in the wreckage.
- The legal team advocated tirelessly for the defendant's rights, eventually uncovering the evidence that led to a full exoneration after years of appeals.

## Pitfalls

- Not "He is a tirelessly worker" but "He is a tireless worker" — Learners often use the adverb form 'tirelessly' to modify a noun, but the adjective 'tireless' is required in that position.

## Usage notes

- Typically follows the verb it modifies or the direct object.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.