English word insane comes from Latin sanus, Latin ingratus (Thankless. Ungrateful. Unpleasant, disagreeable.)
| Dictionary entry | Language | Definition |
|---|---|---|
| sanus | Latin (lat) | (of style) correct, sensible, sober, chaste. Sound in body, healthy. Sound in mind, sane. |
| ingratus | Latin (lat) | Thankless. Ungrateful. Unpleasant, disagreeable. |
| insanus | Latin (lat) | Mad, insane, demented. |
| insane | English (eng) | Causing insanity or madness.. Characterized by insanity or the utmost folly; ridiculous; unpractical. Exhibiting unsoundness or disorder of mind; not sane; mad. Used by, or appropriated to, insane persons. |