The difference between Certainly and Surely

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

check bellow for the other definitions of Certainly and Surely

  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. Surely as an adverb:

    Without fail.

    Examples:

    "slowly but surely'"

  2. Surely as an adverb:

    Certainly, undoubtedly.

    Examples:

    "'Surely, you must be joking."

  3. Surely as an adverb:

    With confidence.

    Examples:

    "His feet were planted surely on the ground."

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