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All answers having "Gloomy" as clue:

3 Character Answers:

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DIM

DUN

GUS

LOW

MOR

SAD



4 Character Answers:

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BLUE

DARK

DOUR

DRAB

GLUM

GRAY

GRIM



5 Character Answers:

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BLEAK

DINGY

DREAR

MURKY

ROACH

UNLIT



6 Character Answers:

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DISMAL

DREARY

FAROFF

MOROSE

SOLEMN

SOMBER

SOMBRE

SULLEN



7 Character Answers:

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INCLUDE

RAYLESS

STYGIAN

SUNLESS



8 Character Answers:

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DOLESOME

DOWNBEAT

FUNEREAL

LOWERING

MOURNFUL

OVERCAST



9 Character Answers:

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CHEERLESS

SATURNINE

TENEBROUS



10 Character Answers:

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SEPULCHRAL



11 Character Answers:

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ATRABILIOUS



12 Character Answers:

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DISCONSOLATE