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All answers having "Dull" as clue:

3 Character Answers:

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DIM

DRY

DYE

RHO



4 Character Answers:

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ARID

BLAH

BONG

DAMP

DRAB

FADE

GREY

HUMD

JADE

PALE

POKY

SLOW

TAME

THUD



5 Character Answers:

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ADMIT

BANAL

BLEAR

BLUNT

CLONK

DENSE

DREAR

DUSTY

FADED

HOHUM

INERT

JADED

LEADY

MATTE

MCJOB

NOFUN

PROSY

TIBIA

UNAPT

VAPID



6 Character Answers:

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BENUMB

BLEARY

BORING

DAMPEN

DEADEN

DREARY

JEJUNE

LEADEN

OBTUSE

OPAQUE

POLISH

STODGY

STOLID

STUPID



7 Character Answers:

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HUMDRUM

INSIPID

MORONIC

MUNDANE

PROSAIC

TEDIOUS

UNSHARP



8 Character Answers:

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FLYBLOWN

STAGNANT

TIRESOME

UNLIVELY



9 Character Answers:

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DRYASDUST

GOGGLEBOX

INANIMATE

LETHARGIC

SLOWITTED



10 Character Answers:

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LACKLUSTER

LACKLUSTRE

UNEVENTFUL



11 Character Answers:

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THICKHEADED

UNSHARPENED



13 Character Answers:

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UNINTERESTING