undoubtedly

/ʌnˈdaʊtɪdli/ (bre, ipa) · /ʌnˈdaʊtɪdli/ (ame, ipa)

undoubtedly — adverb

1. a word used to show that you are completely certain about what you are saying —

1.副詞B2
釋義

a word used to show that you are completely certain about what you are saying — for example, saying that a candidate is undoubtedly the best choice, or that a problem will undoubtedly get worse without action.

例句

Bao is undoubtedly the best person for this new role.

undoubtedly + complement phrase

The documentary about sea turtles was undoubtedly the most popular programme this month.

undoubtedly between verb and complement

同義詞
  • certainly

    the most neutral and frequent equivalent in both speech and writing

  • definitely

    more common in casual conversation; slightly less formal than 'undoubtedly'

  • unquestionably

    more formal, often used in academic or professional analysis

  • assuredly

    rare in modern English; mostly appears in literary or very formal texts

反義詞
  • doubtfully

    expressing uncertainty rather than certainty

  • questionably

    suggesting that the truth of the statement is open to challenge

文法句型

undoubtedly + clause

undoubtedly before main verb

用法筆記

Sentence adverb — it modifies the whole clause, not a single word. In everyday conversation, 'definitely' or 'for sure' are more common alternatives.

常見錯誤

❌She is a undoubtedly talented singer.
✅She is undoubtedly a talented singer.
💡'undoubtedly' is an adverb, so it goes before the article 'a', not after it.
❌That is an undoubtedly fact.
✅That is an undoubted fact.
💡before a noun, use the adjective 'undoubted' instead.