Pronunciation: (pou'ur-ful),[key] —adj. 1. having or exerting great power or force.
2. physically strong, as a person: a large, powerful athlete. 3. producing great physical effects, as a machine or a blow.
4. potent; efficacious: a powerful drug. 5. having great effectiveness, as a speech, speaker, description, reason, etc.
6. having great power, authority, or influence; mighty: a powerful nation. 7. Chiefly South Midland and Southern U.S.great in number or amount: a powerful lot of money.