DictionaryAI

certainly

adverb
SaySUR-tuhn-lee/ˈsɝtn̩li/UK/ˈsɜːtn̩li/

2 meanings of certainly

Practice

  1. 1
    no doubtadverb
    Used to say that something is definitely true, or to say it with no doubt.

    She will certainly pass the test if she keeps studying like this.

    The new road has certainly made the drive into town faster.

    UsagePut it before the main verb (certainly saved), or after be or a helping verb (is certainly true, will certainly come).

    Similardefinitely, surely, undoubtedly, unquestionably, clearly

    Oppositepossibly, perhaps

    Note
  2. 2
    of courseadverb
    Used as a strong way to say yes to a request or question.

    "May I borrow your pen?" "Certainly, here you are."

    "Could you hold the door for a moment?" "Certainly."

    Similarsure, absolutely, definitely, gladly

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Origin

From Middle English certeynly, made from "certain" plus "-ly".

Checked 30 Oct 2026 · 2 facts