Full of power; capable of producing great effects of any kind; potent; mighty; efficacious; intense; as, a powerful man or beast; a powerful engine; a powerful argument; a powerful light; a powerful vessel.
- Having or capable of exerting power.
- Effective or potent: a powerful drug.
- Chiefly Upper Southern U.S. Great: "[Everybody had] a powerful lot to say about faith and good works and free grace and preforeordestination, and I don't know what all” ( Mark Twain).
- Chiefly Upper Southern U.S. Very: It was powerful humid.