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All answers having "Calm" as clue:

3 Character Answers:

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RHO

ZEN



4 Character Answers:

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COOL

DEAD

EASE

EVEN

LULL

PAIX

RAID

REST

TAME



5 Character Answers:

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ALLAY

ALLIS

PEACE

SOOTH

STAID

STILL



6 Character Answers:

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ASSURE

ATEASE

DOCILE

PACIFY

PLACID

REPOSE

SEDATE

SERENE

SETTLE

SMOOTH

SOOTHE



7 Character Answers:

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APPEASE

ASSUAGE

ATPEACE

EQUABLE

PACIFIC

PLACATE

RELAXED

REPOSED

RESTFUL

SEDATED

SILENCE

UNMOVED



8 Character Answers:

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COMPOSED

MODERATE

REASSURE

SERENITY

TRANQUIL



9 Character Answers:

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IMPASSIVE

SETATEASE

STILLNESS

UNALARMED

UNRUFFLED



10 Character Answers:

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COOLHEADED

INSOUCIANT

NONCHALANT

UNAGITATED

UNEVENTFUL



11 Character Answers:

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TRANQUILIZE

UNPERTURBED



12 Character Answers:

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EVENTEMPERED



13 Character Answers:

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IMPERTURBABLE