WordReference Random House Unabridged Dictionary of American English © 2025
im•pu•is•sant
(im pyo̅o̅′ə sənt, im′pyo̅o̅ is′ənt, im pwis′ənt),USA pronunciation adj.
im•pu′is•sance, n.
- lacking strength;
feeble;
weak.
- Middle French; see im-2, puissant
- 1620–30