Webster’s Revised Unabridged Dictionary · 1913
Idiotic
Id′i·ot′ic, Id′i·ot′ic·al, a. [L. idioticus ignorant, Gr. ἰδιωτικός: cf. F. idiotique. See Idiot.] 1. Common; simple. [Obs.] Blackwall.
2. Pertaining to, or like, an idiot; characterized by idiocy; foolish; fatuous; as, an idiotic person, speech, laugh, or action.