idioticEnglishOxford New American Dictionaryidiotic /ˌidēˈädik, ˌɪdiˈɑdɪk / ▸ adjective informal very stupid: I was able to hum its idiotic theme tune. – DERIVATIVES idiotically /ˈˌidēˈädək(ə)lē, ˈˌɪdiˈɑdək(ə)li/ adverb