# lunatic

> English word · Noun · IPA /ˈluːnətɪk/ · frequency rank #16,521

## Definitions
1. An insane person.

## Etymology
From Middle English lunatik, from Old French lunatique, from Late Latin lunaticus (“moonstruck”), derived from Latin luna (“moon”), the connection stemming from the belief that changes of the moon caused intermittent insanity.

## Common misspellings (10)
`llunatic`, `lnuatic`, `luantic`, `lunaitc`, `lunatci`, `lunaticc`, `lunattic`, `lunnatic`, `luntaic`, `ulnatic`

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