IMBECILE Meaning of IMBECILE in English I . a. 1.Weak, feeble, infirm, helpless, decrepit.2.Foolish, witless, drivelling, idiotic, fatuous. II . n. 1.Dotard, feeble person.2.Idiot, natural, congenital ~. Soule. Dictionary of English synonyms. Словарь английских синонимов. 2012