out of true vs untrue

out of true and untrue both are adjectives.

Word	Noun	Adjective	Verb	Adverb
out of true	No	Yes	No	No
untrue	No	Yes	No	No

As adjectives, out of true and untrue are synonyms defined as:

out of true (adjective)	untrue (adjective)
not accurately fitted; not level	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