nonchalantness

Unbothered calm demeanor

Nonchalantness is the quality of appearing casually calm and unconcerned.

The word is a clunky alternative to nonchalance, which says the same thing more gracefully: Her nonchalance in the face of criticism impressed everyone.

Both describe an air of cool indifference, whether genuine or affected.

indifference

unconcern

Absence of worry

blasé · dispassion · apathy · uninterest · uninvolvement · impassivity · uncaring · neutrality · dismissiveness · offhandedness

composure

calmness

Peaceful mental state

equanimity · serenity · self-possession · collectedness · imperturbability · sangfroid · levelheadedness · steadiness · placidity · tranquility

casualness

ease

Lack of strain

effortlessness · airiness · breeziness · lightness · looseness · offhandedness · unstudied · naturalness · spontaneity · unaffectedness

sophistication

suaveness

Smoothly gracious demeanor

polish · smoothness · elegance · refinement · savoir-faire · cosmopolitan · finesse · grace · stylishness · swagger

Opposites
emotional intensity and concern

nonchalantnessanxiety

Persistent apprehensive distress

anxiousness · nervousness · agitation · worry · distress

visible engagement or enthusiasm

nonchalantnessenthusiasm

Intense eager enjoyment

eagerness · excitement · earnestness · intensity · seriousness

Family

nonchalant, unconcerned, indifference, nonchalance, aloofness

Familiarity
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Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G