- 1a rude way to describe a person that you think is very stupid synonym idiot They behaved like imbeciles.
- 2(old-fashioned) (offensive) a person who has a very low level of intelligence
imbecile (also imbecilic adjectivejump to other results
NAmE//ˌɪmbəˈsɪlɪk//) [usually before noun]
imbecilityjump to other results
NAmE//ˌɪmbəˈsɪləti//noun [uncountable, countable]