heartfelt

Compared meaning: honest and coming from real feeling (adjective).

比较义项：真诚的、发自内心的（不虚假）（形容词）。

• genuine

  Genuine describes a feeling or reaction that is real and not faked, often modifying words like smile, surprise or interest; it contrasts directly with something put on or fake.

  genuine 描述真实、没有伪装的情感或反应，常修饰 smile（微笑）、surprise（惊讶）、interest（兴趣）等词；与“假装的、做作的”形成直接对比。

  His surprise looked completely genuine, not staged for the cameras at all.

  他的惊讶看起来完全是真实的，绝不是为镜头摆拍的。

• sincere

  Sincere stresses honesty of intention in speech, especially in fixed phrases such as apology, thanks or wish; it focuses on what someone says rather than raw emotion.

  sincere 强调言语中意图的诚实，常见于固定搭配，如 apology（道歉）、thanks（感谢）、wish（祝愿），侧重的是“说的话”而非纯粹的情感。

  Please accept my sincere apologies for the confusion this delay has caused.

  请接受我诚挚的歉意，为这次延误造成的困扰道歉。

• earnest

  Earnest describes a serious, determined manner or effort rather than just honesty; it pairs with nouns like attempt, effort or request and can sound slightly formal.

  earnest 描述的是严肃、认真投入的态度或努力，而不只是诚实；常与 attempt（尝试）、effort（努力）、request（请求）等名词搭配，语气略显正式。

  He made an earnest effort to fix his mistake before the deadline.

  他在截止日期之前，认真努力地想要弥补自己的错误。

• heartfelt 本词

  Heartfelt emphasizes deep emotional feeling rather than honesty or effort; it is mainly formal or literary, used with nouns like thanks, sympathy or a letter, never with actions.

  heartfelt 强调情感的深厚，而不是诚实或努力；用法较为正式或书面化，常与 thanks（感谢）、sympathy（同情）、letter（信）等名词搭配，不用于修饰具体行动。

  She wrote a heartfelt letter thanking her teacher for years of support.

  她写了一封发自内心的信，感谢老师多年来的支持。

Genuine, sincere, earnest and heartfelt all mean honest, from real feeling. Genuine: a feeling that is real, not faked, like a smile. Sincere: honesty in speech, as in apologies or thanks. Earnest: a serious, determined manner or effort. Heartfelt: deep emotion, formal, used with thanks.

这四个词在表示“真诚、发自内心”时容易混淆，但语气和侧重点不同：genuine 强调情感或反应是真实的、没有伪装；sincere 强调言语或态度诚实可信，常用于道歉、感谢等固定搭配；earnest 强调态度严肃认真、努力用心；heartfelt 强调感情深厚、发自内心，多用于书面或正式场合。这里不比较 genuine 用于物品时表示“真货、非仿制品”的用法（如 genuine leather）。