inconstant vs untrue

inconstant and untrue both are adjectives.

Word	Noun	Adjective	Verb	Adverb
inconstant	No	Yes	No	No
untrue	No	Yes	No	No

inconstant (adjective)	untrue (adjective)
likely to change frequently often without apparent or cogent reason; variable	not according with the facts
	(used especially of persons) not dependable in devotion or affection; unfaithful
	not accurately fitted; not level
	not true to an obligation or trust