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All answers having "Emphatic refusal" as clue:

4 Character Answers:

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NONO

OHNO



5 Character Answers:

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NEVER

NOHOW

NOSIR

NOWAY



6 Character Answers:

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HECKNO

NODICE

NOMAAM

NONONO



7 Character Answers:

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IMEANNO

ISAIDNO

NONEVER

NOSIREE



8 Character Answers:

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IWILLNOT

NONONONO



9 Character Answers:

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NONOTEVER



15 Character Answers:

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NEVERNEVERNEVER