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coolness

noun [U] (CALM)
 
 
/ˈkuːl.nəs/

Definition

C2 the ability to stay calm and act in a reasonable way even in difficult situations: Her coolness in an emergency was admirable.Peaceful and tranquil
(Definition of coolness noun (CALM) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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