Definition of powerful

• (Southern regional intensive) very; "the baby is mighty cute"; "hes mighty tired"; "it is powerful humid"; "that boy is powerful big now"; "they have a right nice place"
• having great power or force or potency or effect; "the most powerful government in western Europe"; "his powerful arms"; "a powerful bomb"; "the horses powerful kick"; "powerful drugs"; "a powerful argument"
• strong enough to knock down or overwhelm; "a knock-down blow"