Which to use
“insane” is an adjective and “insure” is a verb - they look or sound alike but fill different roles in a sentence.
- #3,631
- “insane” frequency rank
- #17,164
- “insure” frequency rank
- 20795
- confusion score
Side-by-Side Comparison
| Feature | insane | insure |
|---|---|---|
| Definition | Exhibiting unsoundness or disorder of mind; not sane; utterly mad. | To provide for compensation if some specified risk occurs. Often agreed by policy (contract) to offer financial compensation in case of an accident, theft or other undesirable event. |
Where the spellings diverge
Shared letters are muted; the letters that actually set insane and insure apart are highlighted. They share 4 letters in sequence, which is exactly why the eye skips the difference.
Spelling & Dictionary Insight
insane and insure form a confusable pair in the English index, two distinct headwords that are easily confused because they look alike, sound alike, or both. They share most of their letters but differ in 2 positions - close enough that the eye skips over the difference, far enough that meaning fully diverges. Our composite confusion score for this pair is 20795, derived from the frequency rank of both members and their visual similarity.
insane is recorded at frequency rank #3,631, classified as anadj, pronounced /ɪnˈseɪn/. insure is at rank #17,164, tagged as averb, pronounced /ɪnˈʃɔː(ɹ)/.
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 20795, this pair ranks #428,600 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Frequency comparison
Frequently Asked Questions
Can "insane" and "insure" be used interchangeably?
Remembering insane vs insure
The fastest way to pick the right one every time.
- Check the role first: if you need an adjective, it's “insane”; for a verb, it's “insure”.
- See each word in full, definition, IPA, etymology and its other confusables. Full “insane” entry
- Browse more pairs most likely to be confused. Most confusable