unconcern vs concern

unconcern and concern both are nouns.

Word	Noun	Adjective	Verb	Adverb
unconcern	Yes	No	No	No
concern	Yes	No	Yes	No

unconcern (noun)	concern (noun)
the trait of remaining calm and seeming not to care; a casual lack of concern	something that interests you because it is important or affects you
a feeling of lack of concern	something or someone that causes anxiety; a source of unhappiness
	a feeling of sympathy for someone or something
	an anxious feeling
	a commercial or industrial enterprise and the people who constitute it

unconcern (verb)	concern (verb)
	be relevant to
	be on the mind of