丢三落四 (diū sān là sì): Forgetful — Meaning & Stroke Order

He is always forgetful when doing things, which makes people very uneasy.

Have you been too tired lately? Why have you started being forgetful again?

She is not consistently forgetful; it only happens when she is dealing with unfamiliar matters.

Despite his outstanding abilities, his forgetful habit often significantly reduces the team's work efficiency.