falseness vs inconstancy

falseness and inconstancy both are nouns.

Word	Noun	Adjective	Verb	Adverb
falseness	Yes	No	No	No
inconstancy	Yes	No	No	No

As nouns, falseness and inconstancy are synonyms defined as:

falseness and inconstancy: unfaithfulness by virtue of being unreliable or treacherous

Other synonyms of falseness include faithlessness, fickleness.

falseness (noun)	inconstancy (noun)
the quality of not being open or truthful; deceitful or hypocritical	the quality of being changeable and variable
unfaithfulness by virtue of being unreliable or treacherous	unfaithfulness by virtue of being unreliable or treacherous
the state of being false or untrue