n.; pl. Imbecilities [ L. imbecillitas: cf. F. imbécillité. ] The quality of being imbecile; weakness; feebleness, esp. of mind. [ 1913 Webster ] Cruelty . . . argues not only a depravedness of nature, but also a meanness of courage and imbecility of mind. Sir W. Temple. [ 1913 Webster ] ☞ This term is used specifically to denote natural weakness of the mental faculties, affecting one's power to act reasonably or intelligently. Syn. -- Debility; infirmity; weakness; feebleness; impotence. See Debility. [ 1913 Webster ] |