Which to use
“tireless” is an adjective and “tirelessly” is an adverb - they look or sound alike but fill different roles in a sentence.
- #27,678
- “tireless” frequency rank
- #26,282
- “tirelessly” frequency rank
- 53960
- confusion score
Side-by-Side Comparison
| Feature | tireless | tirelessly |
|---|---|---|
| Definition | Indefatigable, untiring and not yielding to fatigue | In a tireless manner; without tiring, flagging, or ceasing. |
Letter map: tireless vs tirelessly
Shared letters muted; letters that set tireless and tirelessly apart highlighted. Shared run: 8. tireless runs 8 letters (CVCVCVCC) against tirelessly's 10 (CVCVCVCCCV) - the length gap alone is often enough to separate them once you know to check it.
Role in the sentence - tireless and tirelessly
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: tireless is anadjective and tirelesslyanadverb. On the page they differ by 2 extra letter(s) - “tireless” sits inside “tirelessly”. Our composite confusion score for this pair is 53960, derived from the frequency rank of both members and their visual similarity.
tireless is recorded at frequency rank #27,678, classified as anadj. tirelessly is at rank #26,282, tagged as anadv.
Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.
With a confusion score of 53960, this pair ranks #144,817 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of tireless vs tirelessly
Shared letters: eilrst. Private to "tireless": -. Private to "tirelessly": y.
"tireless" · 8 letters · shape CVCVCVCC · "tirelessly" · 10 letters · shape CVCVCVCCCV
Known mistypes of this pair
- tireless ← itreless · tierless · tireelss · tireles · tirelless · tirelses · tirleess · tirreless
- tirelessly ← itrelessly · tierlessly · tireelssly · tireleslsy · tirelesly · tirelesslly · tirelesslyy · tirelessyl
Frequently Asked Questions
Can "tireless" and "tirelessly" be used interchangeably?
Which is more common, "tireless" or "tirelessly"?
After this comparison
Pair "tireless" vs "tirelessly" is on the table, pick a follow-up below.
- Full dictionary entry for "tireless" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "tirelessly" - compare definitions side by side with the headword page. Word entry
- This pair ranks #144,817 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "tireless" and "tirelessly" also get mixed up with nearby pairs, the highest-scored neighbour is "tiredness vs tireless". Nearby pair
- Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes
Confusion rank #144,817 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.