WordWeb Online

1. Involving the mind or an intellectual process
   "mental images of happy times"; "mental calculations"; "in a terrible mental state"; "mental suffering"; "free from mental defects"
    
2. Affected by a disorder of the mind
   "a mental patient"; "mental illness"
    
3. Of or relating to the mind
   "mental powers"; "mental development"; "mental hygiene"
    
4. (biology) of or relating to the chin- or liplike structure in insects and certain mollusks
    
5. Of or relating to the chin or median part of the lower jaw
   - genial
    
6. [slang] Informal or slang term meaning insane, strange, eccentric or stupid
   - balmy [archaic, slang], barmy [slang], bats [slang], batty [slang], bonkers [slang], buggy [N. Amer, slang], cracked [slang], crackers [slang], daft [Brit, slang], dotty [slang], fruity [slang], haywire [slang], kooky [slang], kookie [slang], loco [slang], loony [slang], loopy [slang], nuts [slang], nutty [slang], round the bend [slang], around the bend [slang], wacky [slang], whacky [slang], doolally [Brit, slang], dippy [slang], daffy [slang], nutsy [N. Amer, slang], potty [Brit, slang], daft as a brush [Brit, slang], round the twist [Brit, slang], wacko [slang], dumbass [N. Amer, slang], bughouse [N. Amer, slang], cuckoo [slang], barking mad [Brit, slang], barking [Brit, slang]

See also: insane, intellectual, moral, noetic, psychic, psychical, psychogenic, psychological, rational, unhealthy

Antonym: physical

Encyclopedia: Mental