/im'beuh sil"i tee/ , n. , pl. imbecilities .
1. Psychol. the state of being an imbecile.
2. an instance or point of weakness; feebleness; incapability.
3. stupidity; silliness; absurdity.
4. an instance of this.
[ 1525-35; earlier imbecillity imbecillitas. See IMBECILE, -ITY ]