Powerful

a. 1. Full of power; capable of producing great effects of any kind; as, a powerful man or animal; a powerful army or navy; a powerful government; a powerful argument; a powerful light. 2. Great; uncommon; as, a powerful sight of logs. [A Westernism.] [Vulgar.] Bartlett. Syn.—Mighty; strong; potent; efficacious; energetic; intense.

Exceedingly; greatly; very; as, I felt powerful weak. [Vulgar.] Bartlett.