[ im-buh-sil-i-tee ]
/ ˌɪm bəˈsɪl ɪ ti /

noun, plural im·be·cil·i·ties.

an instance or point of weakness; feebleness; incapability.
stupidity; silliness; absurdity.
an instance of this.
Psychology. (no longer in technical use; considered offensive) the state of being an imbecile.

Origin of imbecility

1525–35; earlier imbecillity < Latin imbēcillitās. See imbecile, -ity Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for imbecility