Which to use
“inefficiency” is a noun and “inefficient” is an adjective - they look or sound alike but fill different roles in a sentence.
- #33,282
- “inefficiency” frequency rank
- #15,838
- “inefficient” frequency rank
- 49120
- confusion score
Side-by-Side Comparison
| Feature | inefficiency | inefficient |
|---|---|---|
| Definition | Lack of efficiency or effectiveness. | Not efficient; not producing the effect intended or desired; inefficacious. |
Letter map: inefficiency vs inefficient
Shared letters muted; letters that set inefficiency and inefficient apart highlighted. Shared run: 10.
Grammar separator: inefficiency vs inefficient
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: inefficiency is anoun and inefficientanadjective. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 49120, derived from the frequency rank of both members and their visual similarity.
inefficiency is recorded at frequency rank #33,282, classified as anoun. inefficient is at rank #15,838, tagged as anadj, pronounced /ˌɪn.ɪˈfɪʃ.ənt/.
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 49120, this pair ranks #186,630 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of inefficiency vs inefficient
Shared letters: cefin. Private to "inefficiency": y. Private to "inefficient": t.
"inefficiency" · 12 letters · shape VCVCCVCVVCCV · "inefficient" · 11 letters · shape VCVCCVCVVCC
Known mistypes of this pair
- inefficiency ← ienfficiency · ineffciiency · inefficciency · inefficeincy · inefficiecny · inefficienccy · inefficiencyy · inefficienncy
- inefficient ← ienfficient · ineffciient · inefficcient · inefficeint · inefficiennt · inefficientt · inefficietn · inefficinet
Frequently Asked Questions
Is swapping "inefficiency" for "inefficient" ever safe?
In ordinary English text, does "inefficiency" or "inefficient" show up more?
Useful next steps
Pair "inefficiency" vs "inefficient" is on the table, pick a follow-up below.
- Full dictionary entry for "inefficiency" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "inefficient" - compare definitions side by side with the headword page. Word entry
- This pair ranks #186,630 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "inefficiency" and "inefficient" also get mixed up with nearby pairs, the highest-scored neighbour is "inefficiency vs insufficiency". 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 #186,630 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.