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All answers having "Unruffled" as clue:

3 Character Answers:

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RHO



4 Character Answers:

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CALM

COOL

EVEN



5 Character Answers:

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BLASE

QUIET

STOIC



6 Character Answers:

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ATEASE

PLACID

SEDATE

SERENE

SMOOTH



7 Character Answers:

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PATIENT



8 Character Answers:

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TRANQUIL



9 Character Answers:

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COLLECTED



10 Character Answers:

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PHLEGMATIC



11 Character Answers:

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PHILOSOPHIC



13 Character Answers:

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IMPERTURBABLE



14 Character Answers:

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COOLASAQCUMBER



15 Character Answers:

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CALMASANICEBERG

COOLASACUCUMBER