Entry 2 senses Webster, 1913 Idiotic /ĭdˌ-ē-ät'-ĭk/ · Id·i·ot·ic · IPA /ˌɪdiˈɑtɪk/ 01 a. Common; simple. 1. Common; simple.[Obs.] 2. Pertaining to, or like, an idiot; characterized by idiocy; foolish; fatuous; as, an idiotic person, speech, laugh, or action.