(무엇의 양이) 부족하다 = 충분한 무엇이 없다. I don't have enough time / money. I don't have enough experience yet. There aren't enough seats. 어떤 특징이 부족한 = 충분하지 않다 = 부족하다. It's not good enough. It's not big/small/cold/hot enough. 비록 그녀는 빠르게 회복하고 있지만 훈련을 시작하기에는 아직 부족하다. Although she has been recovering very quickly, she's still not strong enough to start training. (=she's not strong enough to start training yet = ..