Physically or mentally weak; frail, delicate, or sickly in appearance or constitution.
最近彼はひ弱になって、すぐに疲れてしまう。
Lately he has become weak and gets tired easily.
子どもは体がひ弱で風邪をひきやすい。
The child is frail and easily catches colds.
見た目はひ弱だが、意志は強い人だ。
He looks frail, but he has a strong will.