1Lacking in strength, power, or ability; also used for something faint or mild in taste/effect, or for having low tolerance/resistance to something.
彼は体が弱いので、よく風邪をひく。
He has a weak constitution, so he often catches colds.
このお茶は味が弱くて、少し水っぽい。
This tea is weak in flavor and tastes a bit watery.
私は寒さに弱くて、冬が苦手だ。
I'm sensitive to cold, so I don't like winter.
彼はお酒に弱いから、すぐ顔が赤くなる。
He can't hold his liquor well, so his face turns red right away.