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All answers having "Vexatious" as clue:

4 Character Answers:

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AHOY

MEAN

SORE



5 Character Answers:

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NASTY

PESKY



6 Character Answers:

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THORNY

TRYING



7 Character Answers:

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GALLING

IRKSOME

URANIUM



8 Character Answers:

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ANNOYING

WEARIFUL



9 Character Answers:

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MADDENING



10 Character Answers:

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BOTHERSOME



11 Character Answers:

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MOTHERGOOSE

TROUBLESOME