The difference between Certainly and Incidentally

When used as adverbs, certainly means in a way which is certain, whereas incidentally means in an incidental manner.

check bellow for the other definitions of Certainly and Incidentally

  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. Incidentally as an adverb (manner):

    In an incidental manner; not of central or critical importance.

    Examples:

    "The book discussed the subject, but only incidentally."

  2. Incidentally as an adverb:

    By chance; in an unplanned way.

  3. Incidentally as an adverb (speech act, conjunctive):

    Parenthetically, by the way.

    Examples:

    "Incidentally, did you hear anything new from your brother yesterday?"

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