隐忍 means 'to conceal and endure (quietly)' — a compound verb where 隐 (yǐn) means 'to hide, conceal, or keep secret', and 忍 (rěn) means 'to endure, bear, or suppress'. Together, they describe the act of inwardly suppressing strong feelings — such as anger, grief, or injustice — without outward expression, often for strategic, moral, or relational reasons. It implies patience, self-restraint, and emotional discipline, not passive weakness.

This word carries a slightly literary or formal tone and is common in written Chinese, historical narratives, and serious discussions about personal conduct or social dynamics. It’s often used to describe admirable resilience — for example, someone enduring hardship silently to protect others or await a better moment to act. Unlike simple endurance (忍受), 隐忍 emphasizes the conscious choice to conceal one’s inner state while bearing difficulty.