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All answers having "Dreadful" as clue:

3 Character Answers:

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BAD



4 Character Answers:

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DIRE

EVIL

FELL

GRIM

VILE



5 Character Answers:

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AWFUL

LOUSY

REBUS



6 Character Answers:

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HORRID

TRAGIC

UGSOME



7 Character Answers:

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ABYSMAL

AWESOME

GHASTLY



8 Character Answers:

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HORRIBLE

HORRIFIC

SHOCKING

TERRIBLE



9 Character Answers:

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APPALLING

ATROCIOUS



10 Character Answers:

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FROMHUNGER

HORRENDOUS

TERRIFYING



11 Character Answers:

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UNSPEAKABLE