Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun imbecile

1 sense of imbecile

Sense 1
idiot, imbecile, cretin, moron, changeling, half-wit, retard -- (a person of subnormal intelligence)
       => simpleton, simple -- (a person lacking intelligence or common sense)

Antonyms of adj imbecile

1 sense of imbecile

Sense 1
imbecile, imbecilic, idiotic -- (having a mental age of three to seven years)

INDIRECT (VIA retarded) -> precocious -- (characterized by or characteristic of exceptionally early development or maturity (especially in mental aptitude); "a precocious child"; "a precocious achievement")

Similarity of adj imbecile

1 sense of imbecile

Sense 1
imbecile, imbecilic, idiotic -- (having a mental age of three to seven years)
       => retarded (vs. precocious) -- (relatively slow in mental or emotional or physical development; "providing a secure and sometimes happy life for the retarded")