# insane

> English word · Adjective · IPA /ɪnˈseɪn/ · frequency rank #3,631

## Definitions
1. Exhibiting unsoundness or disorder of mind; not sane; utterly mad.
2. Used by or relating to insane people.
3. Causing insanity or madness.
4. Characterized by excess or the utmost folly; ridiculous; impractical.
5. Extremely good; incredibly amazing.
6. Enraged; furious.

## Etymology
From Latin īnsānus (“unsound in mind; mad, insane”), from in- + sānus (“sound, sane”), equivalent to in- + sane.

## Easily confused with
- **inside** (https://plainspell.com/en/vs/insane-vs-inside)
- **intake** (https://plainspell.com/en/vs/insane-vs-intake)
- **invade** (https://plainspell.com/en/vs/insane-vs-invade)
- **insure** (https://plainspell.com/en/vs/insane-vs-insure)
- **instant** (https://plainspell.com/en/vs/insane-vs-instant)
- **instance** (https://plainspell.com/en/vs/insane-vs-instance)
- **insanely** (https://plainspell.com/en/vs/insane-vs-insanely)
- **Inman** (https://plainspell.com/en/vs/inman-vs-insane)
- **inane** (https://plainspell.com/en/vs/inane-vs-insane)
- **infant** (https://plainspell.com/en/vs/infant-vs-insane)
- **inland** (https://plainspell.com/en/vs/inland-vs-insane)
- **inmate** (https://plainspell.com/en/vs/inmate-vs-insane)
- **innate** (https://plainspell.com/en/vs/innate-vs-insane)
- **inhale** (https://plainspell.com/en/vs/inhale-vs-insane)
- **inline** (https://plainspell.com/en/vs/inline-vs-insane)
- **incase** (https://plainspell.com/en/vs/incase-vs-insane)

## Common misspellings (8)
`inasne`, `innsane`, `insaen`, `insanne`, `insnae`, `inssane`, `isnane`, `nisane`

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/insane