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All answers having "___ Hard" as clue:

3 Character Answers:

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DIE



4 Character Answers:

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ALEE

ATIT

CASH

CORE



5 Character Answers:

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AGREE

APORT

CIDER

RIGID

SOLID

STERN

STIFF

STONY

TOUGH



6 Character Answers:

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BODIED

FLINTY

SEVERE

STEELY



7 Character Answers:

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ADAMANT

ARDUOUS

ASAROCK



8 Character Answers:

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OBDURATE

SEVERELY



9 Character Answers:

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STONELIKE



10 Character Answers:

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ADAMANTINE



11 Character Answers:

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IMPERMEABLE