Which to use
“fail” is a verb and “fairly” is an adverb - they look or sound alike but fill different roles in a sentence.
- #2,441
- “fail” frequency rank
- #2,994
- “fairly” frequency rank
- 5435
- confusion score
Side-by-Side Comparison
| Feature | fail | fairly |
|---|---|---|
| Definition | To be unsuccessful. | In a fair manner; fair; not biased or skewed or favouring a certain party |
Where the eye mixes fail and fairly
Muted = shared; highlighted = the visual trap. They share 4 letters in sequence. fail runs 4 letters (CVVC) against fairly's 6 (CVVCCV) - the length gap alone is often enough to separate them once you know to check it.
Why the eye confuses fail with fairly
These two trip readers on the page rather than in the ear: fail is /feɪl/ while fairly is /ˈfɛə(ɹ).li/. Spoken aloud the problem disappears. In writing it persists, because they differ by 2 letter(s) in length, and the parts of speech differ too (verb vs adverb), which is usually the fastest check. Our composite confusion score for this pair is 5435, derived from the frequency rank of both members and their visual similarity.
fail is recorded at frequency rank #2,441, classified as averb, pronounced /feɪl/. fairly is at rank #2,994, tagged as anadv, pronounced /ˈfɛə(ɹ).li/.
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 5435, this pair ranks #515,338 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of fail vs fairly
Shared letters: afil. Private to "fail": -. Private to "fairly": ry.
"fail" · 4 letters · shape CVVC · "fairly" · 6 letters · shape CVVCCV
Known mistypes of this pair
Frequently Asked Questions
Is swapping "fail" for "fairly" ever safe?
Frequency check: "fail" vs "fairly" - which ranks higher?
What to do next
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "fail" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "fairly" - compare definitions side by side with the headword page. Word entry
- This pair ranks #515,338 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "fail" and "fairly" also get mixed up with nearby pairs, the highest-scored neighbour is "fail vs flail". 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 #515,338 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.