Source : Webster's Revised Unabridged Dictionary (1913)

Idiotic \Id`i*ot"ic\, Idiotical \Id`i*ot"ic*al\, a. [L.
   idioticus ignorant, Gr. ?: 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.