Etymology
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idiotic (adj.)

1713, from idiot + -ic or from Late Latin idioticus "uneducated, ignorant," in classical Latin, "of an ordinary person," from Greek idiotikos "unprofessional, unskilled; not done by rules of art, unprofessional," from idiotes "unskilled person" (see idiot). Idiotical is from 1640s. Related: Idiotically.

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Definitions of idiotic

idiotic (adj.)
insanely irresponsible;
an idiotic idea
Synonyms: crackbrained
idiotic (adj.)
so unreasonable as to invite derision;
idiotic (adj.)
having a mental age of three to seven years;
Synonyms: imbecile / imbecilic
From wordnet.princeton.edu