sincerely

Compared meaning: sincerely, genuinely (adverb).

比较义项：真诚地／诚恳地（副词）。

• truly

  A general intensifier meaning 'really, genuinely'; it freely modifies adjectives, adverbs and verbs in neutral or informal contexts, not limited to emotional speech acts.

  是一个通用程度副词，意为“真的、确实”，可以在中性或非正式语境中修饰几乎任何形容词、副词或动词，并不局限于表达情感的言语行为。

  The soup smelled truly amazing after a long day of hiking.

  徒步一整天后，这汤闻起来真的很美味。

• sincerely 本词

  Specifically expresses genuine, heartfelt feeling in emotional or social speech acts such as apologizing, thanking or hoping; more formal, and cannot modify a plain adjective like 'amazing'.

  专门用于道歉、感谢、希望等表达真挚情感的言语行为，语气更正式，不能像truly那样修饰“amazing”这样的普通形容词。

  She sincerely apologized for forgetting her friend's birthday.

  她为忘记朋友的生日而诚恳地道歉。

Truly and sincerely both mean genuine, not false, feeling. Truly is a general intensifier meaning 'really', freely modifying adjectives, adverbs, and verbs in neutral or casual contexts. Sincerely is more formal, used mainly in emotional speech acts like apologizing, thanking, or hoping.

这两个词都表示某种情感或想法是真实而非虚假的，但适用范围不同：truly是通用程度副词，几乎可以修饰任何形容词、副词或动词，语气中性偏口语；sincerely更正式，通常只用于道歉、感谢、希望等表达真挚情感的言语行为。