na-adjective, noun
timid; faint-hearted; weak-willed
Describes a person who lacks courage, is easily intimidated, or gives in under pressure. Often used for someone who is gentle but not assertive.
彼は気弱で、いつも人の意見に流されてしまう。
He is timid and always gets swayed by other people's opinions.
気弱な性格だから、強く言われると
Because of my faint-hearted nature, I immediately apologize when someone speaks strongly to me.