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All answers having "Obstinate" as clue:

3 Character Answers:

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WIN



4 Character Answers:

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HARD

MARE



5 Character Answers:

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BALKY

NIECE



6 Character Answers:

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DOGGED

MULISH

ORNERY

WILFUL



7 Character Answers:

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ADAMANT

ASININE



8 Character Answers:

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CONTRARY

PERVERSE

STUBBORN



9 Character Answers:

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PIGHEADED

RESISTIVE



10 Character Answers:

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BULLHEADED

HEADSTRONG

SELFWILLED



12 Character Answers:

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INTRANSIGENT



15 Character Answers:

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STUBBORNASAMULE