truly

Compared meaning: really, used to add emphasis (adverb).

比较义项：表示“确实、真的”，用于加强语气（副词）。

• really

  The most common, everyday intensifier; used casually to strengthen adjectives, verbs, or whole statements, and common even in questions and negative sentences.

  最常见、最口语化的强调词，用来加强形容词、动词或整句话的语气，日常口语中随处可见，也常用于否定句和疑问句。

  That new pizza place is really good; you should try it sometime.

  那家新披萨店真的很好吃，你应该找时间去试试。

• truly 本词

  More formal and heartfelt than really; typically modifies verbs of belief, feeling, or gratitude, and stresses sincere conviction rather than casual emphasis; rare in negatives or questions.

  truly比really更正式、更真挚，常修饰表示信念、情感或感激的动词，强调发自内心的诚恳，而不是随口的加强语气；较少用在否定句或疑问句中。

  We are truly grateful for everyone who helped after the storm.

  对于风暴过后帮助过我们的每一个人，我们由衷地感激。

Really and truly both add emphasis, meaning 'indeed'. Really is casual and common, strengthening almost any word, even in questions or negatives. Truly is more formal, usually with verbs of belief, feeling, or thanks, showing sincere emotion. The letter-closing 'Yours truly' is not compared here.

really和truly在这个义项中都表示“确实、真的”，用来加强语气，但语气强弱和正式程度不同：really更口语、更随意，几乎可以修饰任何词语，也常见于否定句和疑问句；truly更正式、更书面，常用于表达信念、情感或感激等真挚的心情。另外，truly还有“您忠实的”（Yours truly，书信落款用语）等这里不比较的其他用法。

Compared meaning: sincerely, genuinely (adverb).

比较义项：真诚地／诚恳地（副词）。

• truly 本词

  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

  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。