adjective
describing the feeling of fear or apprehension
adverb
modifying the verb 'not' to indicate a negative response
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I'm afraid not, as the deadline for submissions has already passed.
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Sorry, afraid not, I already promised to help someone else that day.
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Afraid not, dude. I've got plans with my crew that night.
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I'm afraid not, the odds of that happening are slim to none.