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All answers having "Nasty" as clue:

3 Character Answers:

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BAD

ICK



4 Character Answers:

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ACID

ICKY

ILIE

MEAN

RICO

UGLY

VILE

YUCK



5 Character Answers:

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AWFUL

CATTY

SNIDE



6 Character Answers:

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AMPERE

HORRID

ODIOUS

STINKY



7 Character Answers:

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BEASTLY

NOTNICE

VICIOUS



8 Character Answers:

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DERISIVE

SPITEFUL



10 Character Answers:

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UNPLEASANT