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Nonchalance
Context Matters
Use 'nonchalance' to describe a calm attitude in situations where others may be anxious or excited. 
Subtle Coolness
'Nonchalance' often implies a confident, cool demeanor that's not overdone or arrogant. 
Mistaken Aloofness
Be careful; 'nonchalance' can sometimes be interpreted as a lack of interest or empathy. 