Dictionary
non•cha•lant
Pronunciation: (non"shu-länt', non'shu-länt", -lunt), [key]—
adj.
coolly unconcerned, indifferent, or unexcited; casual:
His nonchalant manner infuriated me. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.