Which to use
“relentless” is an adjective and “relentlessly” is an adverb - they look or sound alike but fill different roles in a sentence.
- #14,823
- “relentless” frequency rank
- #22,197
- “relentlessly” frequency rank
- 37020
- confusion score
Side-by-Side Comparison
| Feature | relentless | relentlessly |
|---|---|---|
| Definition | Unrelenting or unyielding in severity. | In a relentless manner. |
Where the spellings diverge
Shared letters are muted; the letters that actually set relentless and relentlessly apart are highlighted. They share 10 letters in sequence, which is exactly why the eye skips the difference.
Spelling & Dictionary Insight
relentless and relentlessly form a confusable pair in the English index, two distinct headwords that are easily confused because they look alike, sound alike, or both. They differ by 2 extra letter(s) - “relentless” sits inside “relentlessly” - close enough that the eye skips over the difference, far enough that meaning fully diverges. Our composite confusion score for this pair is 37020, derived from the frequency rank of both members and their visual similarity.
relentless is recorded at frequency rank #14,823, classified as anadj, pronounced /ɹɪˈlɛntləs/. relentlessly is at rank #22,197, tagged as anadv, pronounced /ɹɪˈlɛntləsli/.
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 37020, this pair ranks #298,127 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Frequency comparison
Frequently Asked Questions
Can "relentless" and "relentlessly" be used interchangeably?
Remembering relentless vs relentlessly
The fastest way to pick the right one every time.
- Check the role first: if you need an adjective, it's “relentless”; for an adverb, it's “relentlessly”.
- See each word in full, definition, IPA, etymology and its other confusables. Full “relentless” entry
- Browse more pairs most likely to be confused. Most confusable