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nonchalant

non·cha·lant

nonchalant

 
pronunciation:
nan sh lant
part of speech: adjective
definition: not showing excitement or anxiety; coolly confident, unflustered, or unworried;casually indifferent.
The first suspect was nervous and edgy, but the second was completely nonchalant.
synonyms:
casual, confident, cool, imperturbable, unconcerned, unruffled
antonyms:
anxious
similar words:
blithe, breezy, careless, cavalier, devil-may-care, indifferent, insouciant, negligent, unflappable, unworried
derivation: nonchalantly (adv.)