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All answers having "Uncompromising" as clue:

4 Character Answers:

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GRIM



5 Character Answers:

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ADAMA

HARSH

RIGID

STERN

TOUGH



6 Character Answers:

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SEVERE

STRICT

STURDY



7 Character Answers:

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ADAMANT

AUSTERE

EXTREME



8 Character Answers:

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HARDCORE

HARDLINE



9 Character Answers:

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ALLORNONE



10 Character Answers:

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BRASSBOUND

RELENTLESS



11 Character Answers:

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HARDHITTING



13 Character Answers:

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BLACKANDWHITE