nonchalant vs unconcerned

nonchalant and unconcerned both are adjectives.

Word	Noun	Adjective	Verb	Adverb
nonchalant	No	Yes	No	No
unconcerned	No	Yes	No	No

nonchalant (adjective)	unconcerned (adjective)
marked by blithe unconcern	lacking in interest or care or feeling
	not occupied or engaged with
	easy in mind; not worried