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All answers having "Garish" as clue:

4 Character Answers:

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LOUD



5 Character Answers:

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DODGE

FLARY

GAUDY

LURID

SHOWY



6 Character Answers:

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FLASHY

GLITZY

ROCOCO

TAWDRY



7 Character Answers:

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BLATANT



8 Character Answers:

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TINSELLY