Imbecile

Webster's Dictionary of the English Language

·noun One destitute of strength; ·esp., one of feeble mind.

II. Imbecile ·vt To Weaken; to make imbecile; as, to imbecile men's courage.

III. Imbecile ·adj Destitute of strength, whether of body or mind; feeble; impotent; ·esp., mentally wea; feeble-minded; as, hospitals for the imbecile and insane.