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mental

adjective

of or relating to the mind: mental powers; mental suffering.
of, relating to, or affected by a disorder of the mind: a mental patient; mental illness.
providing care for persons with disordered minds, emotions, etc.: a mental hospital.
performed by or existing in the mind: mental arithmetic; a mental note.
pertaining to intellectuals or intellectual activity.
Informal. slightly daft; out of one’s mind; crazy: He’s mental.

noun

Informal. a person with a psychological disorder: a fascist group made up largely of mentals.

adjective

of or relating to the chin.

adjective

of or involving the mind or an intellectual process
occurring only in the mindmental calculations
affected by mental illnessa mental patient Preferred form: psychiatric
concerned with care for persons with mental illnessa mental hospital Preferred form: psychiatric
slang insane

adjective

anatomy of or relating to the chinAlso: genial

adj.early 15c., “pertaining to the mind,” from Middle French mental, from Late Latin mentalis “of the mind,” from Latin mens (genitive mentis) “mind,” from PIE root *men- “to think” (cf. Sanskrit matih “thought, mind,” Gothic gamunds, Old English gemynd “memory, remembrance;” see mind (n.)). Meaning “crazy, deranged” is from 1927, probably from combinations such as mental hospital.