• Basic forms
• 慎む — be careful; refrain; act modestly / base form
• 慎みます — is careful; refrains / masu form
• 慎んだ — was careful; refrained / ta form
• 慎んで — being careful … / te form
• 慎まない — do not refrain / negative
• 慎めば — if (one) is careful / conditional
• 慎め — be careful! / imperative
• Common expressions
• 言動を慎む — be careful with one’s words and actions
• 行動を慎む — restrain one’s behavior
• 酒を慎む — refrain from drinking alcohol
• More
• 慎んでおります — am refraining (polite / formal)

慎む（つつしむ） is a godan verb. It means to act with restraint or care, often used in polite, formal, or moral contexts.