Imbecile

(ĭm'be-sĭl, or ĭm'be-seel') (Synop., § 130), n. [Lat. imbecillis and imbecillus, from prefix im, for in, and bacillum, a small staff, because he who is weak or infirm of foot leans upon a staff; Fr. imbécile, Sp. imbecil, It. imbecille.] Destitute of strength, either of body or of mind; weak; feeble; impotent; decrepit; as, an imbecile old man. “Imbecile and lost.” Barrow.

Synonyms—Weak; debilitated; feeble; infirm; impotent.