寒心 literally means 'cold heart' — combining 寒 (hán, 'cold') and 心 (xīn, 'heart'). It describes a deep emotional chill: not physical coldness, but the profound disappointment, disillusionment, or sorrow one feels when trust is broken, expectations are shattered, or kindness is met with ingratitude. It implies a quiet, inward loss of warmth or hope — more severe than mere disappointment, yet less dramatic than despair.

This word is commonly used in serious or reflective contexts: describing reactions to betrayal by loved ones, corruption in institutions, or repeated failures of integrity. It’s often found in written Chinese and formal speech, carrying a tone of dignified sorrow rather than anger. While it can function as a predicate adjective ('He felt deeply disappointed'), it rarely serves as a standalone noun or verb without modification.