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All answers having "Unpleasant" as clue:

3 Character Answers:

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BAD

EEL

GYM

ICY

RHO

RUG



4 Character Answers:

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GORY

GRIM

ICKY

SOUR

UGLY

VILE



5 Character Answers:

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AWFUL

CHASM

EXIST

HARSH

HOPES

MESSY

NASTY

OPERA

RATTY

RULES

SEAMY



6 Character Answers:

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AUGEAN

CRABBY

DORSET

HORRID

STINKY

STRIDE



7 Character Answers:

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BEASTLY

MIASMIC

NOTNICE



8 Character Answers:

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ACROSTIC

AVERSION

ECSTATIC

SELFLESS

STINKPOT



9 Character Answers:

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INCLEMENT



11 Character Answers:

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DISTASTEFUL

RESPIRATION



12 Character Answers:

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DISAGREEABLE



13 Character Answers:

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OBJECTIONABLE



15 Character Answers:

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CONCRETEJUNGLES