(derogatory) A person of low general intelligence. / (derogatory) A person who makes stupid decisions; a fool.

(uncommon) idiotic, stupid

(of a person or animal) Pertaining to or resembling an idiot; characterised with behaviour resembling idiocy. / (of an action) Having the quality of idiocy; very foolish

In an idiotic manner.

plural of idiot

(archaic) simple, unlearned.

(now chiefly historical) Very severe mental retardation. / A foolish utterance.

Idiom. / An overly literal translation of an idiom.

plural of idiotism

(obsolete) Rendered idiotic; befooled.