The difference between Certainly and Undoubtedly

When used as adverbs, certainly means in a way which is certain, whereas undoubtedly means without doubt.

check bellow for the other definitions of Certainly and Undoubtedly

  1. Certainly as an adverb:

    In a way which is certain; with certainty.

  2. Certainly as an adverb:

    Without doubt, surely.

    Examples:

    "The accident was certainly caused by human error."

    "That was certainly sweet of him."

    "You may certainly join us for dinner."

  3. Certainly as an adverb:

    An emphatic affirmative answer; of course.

    Examples:

    "Would you like it with ice?  Certainly, and with lemon please."

  1. Undoubtedly as an adverb:

    Without doubt; definitely.

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