insincere vs sincerity

insincere is not a noun while sincerity is a noun.

Word	Noun	Adjective	Verb	Adverb
insincere	No	Yes	No	No
sincerity	Yes	No	No	No

insincere (noun)	sincerity (noun)
	the quality of being open and truthful; not deceitful or hypocritical
	the trait of being serious
	a quality of naturalness and simplicity
	an earnest and sincere feeling

insincere (adjective)	sincerity (adjective)
lacking sincerity