IDIOTIC
imbecile, imbecilic, idiotic
(adjective) having a mental age of three to seven years
crackbrained, idiotic
(adjective) insanely irresponsible; “an idiotic idea”
absurd, cockeyed, derisory, idiotic, laughable, ludicrous, nonsensical, preposterous, ridiculous
(adjective) so unreasonable as to invite derision; “the absurd excuse that the dog ate his homework”; “that’s a cockeyed idea”; “ask a nonsensical question and get a nonsensical answer”; “a contribution so small as to be laughable”; “it is ludicrous to call a cottage a mansion”; “a preposterous attempt to turn back the pages of history”; “her conceited assumption of universal interest in her rather dull children was ridiculous”
Source: WordNet® 3.1
Etymology
Adjective
idiotic (comparative more idiotic, superlative most idiotic)
(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
Synonyms: stupid, nonsensical
Synonyms
• idiotish
Source: Wiktionary
Id`i*ot"ic, Id`i*ot"ic*al, a. Etym: [L. idioticus ignorant, Gr.
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.
Source: Webster’s Unabridged Dictionary 1913 Edition