真诚 (zhēn chéng) is an adjective meaning 'sincere' or 'heartfelt', describing genuine feelings, intentions, or expressions that are free from pretense or deception. The character 真 means 'true' or 'real', emphasizing authenticity, while 诚 means 'honesty' or 'integrity', reflecting moral uprightness and openness. Together, they form a compound that conveys deep emotional honesty — not just saying the right thing, but meaning it wholeheartedly.

This word is commonly used to describe people’s attitudes, speech, apologies, compliments, or relationships. It often appears in formal or warm interpersonal contexts — such as expressing gratitude, offering reassurance, or evaluating someone’s character. While it can occasionally function as a noun (e.g., in phrases like 表达真诚), its primary and most natural use is adjectival. It carries a positive, respectful tone and is frequently found in both spoken and written Chinese, especially in situations valuing trust and emotional authenticity.