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.
He is timid and always gets swayed by other people's opinions.
Because of my faint-hearted nature, I immediately apologize when someone speaks strongly to me.
気弱 describes someone who is weak-willed or lacks resolve in general situations, while 臆病 specifically describes fearfulness and cowardice in the face of danger or risk.
気弱 simply describes a timid personality, while だらしない (in its weak-willed sense) carries a scolding tone about someone giving in too easily.
気弱 describes someone timid and easily discouraged, the direct opposite of 気丈, which describes someone mentally strong and unshaken.
気弱 describes an inherently timid personality, while 弱気 usually describes a temporary lack of confidence or a pessimistic mood in a specific situation.
Compound of 気 (spirit, mind) and 弱 (weak). The exact historical derivation is uncertain, but the meaning is transparent from its components.