Definition of of course not
—used informally to say no in a way that shows one is very definite "Are you angry with me for being late?" "Of course not!""Did you take the money?" "Of course not!"
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“Of course not.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/of%20course%20not. Accessed 30 Nov. 2021.
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