Which to use
“insufficiency” is a noun and “insufficiently” is an adverb - they look or sound alike but fill different roles in a sentence.
- #42,207
- “insufficiency” frequency rank
- #38,910
- “insufficiently” frequency rank
- 81117
- confusion score
Side-by-Side Comparison
| Feature | insufficiency | insufficiently |
|---|---|---|
| Definition | The lack of sufficiency: a shortage, the state of having or being not enough (of something). | Not sufficiently. |
Where the spellings diverge
Shared letters are muted; the letters that actually set insufficiency and insufficiently apart are highlighted. They share 12 letters in sequence, which is exactly why the eye skips the difference.
Spelling & Dictionary Insight
insufficiency and insufficiently 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 1 letter(s) in length - close enough that the eye skips over the difference, far enough that meaning fully diverges. Our composite confusion score for this pair is 81117, derived from the frequency rank of both members and their visual similarity.
insufficiency is recorded at frequency rank #42,207, classified as anoun, pronounced /ɪnsəˈfɪʃənsi/. insufficiently is at rank #38,910, 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 81117, this pair ranks #18,353 of 530,003 scored English confusable pairs - among the most confusable pairs.
Frequency comparison
Frequently Asked Questions
Can "insufficiency" and "insufficiently" be used interchangeably?
Remembering insufficiency vs insufficiently
The fastest way to pick the right one every time.
- Check the role first: if you need a noun, it's “insufficiency”; for an adverb, it's “insufficiently”.
- See each word in full, definition, IPA, etymology and its other confusables. Full “insufficiency” entry
- Browse more pairs most likely to be confused. Most confusable