powerful in WordNet English dictionary

1. (of a person) possessing physical strength and weight; rugged and powerful
   "a hefty athlete"; "a muscular boxer"; "powerful arms"
   brawny  hefty  muscular  powerful  sinewy 
   
2. displaying superhuman strength or power
   "herculean exertions"
   herculean  powerful 
   
3. strong enough to knock down or overwhelm
   "a knock-down blow"
   knock-down  powerful 
   
4. having great influence
   potent  powerful 
   
5. having great power or force or potency or effect
   "the most powerful government in western Europe"; "his powerful arms"; "a powerful bomb"; "the horse's powerful kick"; "powerful drugs"; "a powerful argument"
   powerful 
   

1. (Southern regional intensive) very; to a great degree
   "the baby is mighty cute"; "he's mighty tired"; "it is powerful humid"; "that boy is powerful big now"; "they have a right nice place"; "they rejoiced mightily"
   mighty  mightily  powerful  right  mighty  mightily  powerful  right