powerful: ad j e having great power; very strong; full of force Examples Tom is a very powerful swimmer; he has powerful arms and legs. Powerful nations sometimes try to control weaker ones Onions have a powerful smell. Electric current is often powerful enough to killpowerful: adj. having great power; very strong; full of force Examples • Tom is a very powerful swimmer; he has powerful arms and legs. • Powerful nations sometimes try to control weaker ones. • Onions have a powerful smell. • Electric current is often powerful enough to kill