untrustworthiness vs untrustiness

untrustworthiness and untrustiness both are nouns.

Word	Noun	Adjective	Verb	Adverb
untrustworthiness	Yes	No	No	No
untrustiness	Yes	No	No	No

As nouns, untrustworthiness and untrustiness are synonyms defined as:

untrustworthiness and untrustiness: the trait of not deserving trust or confidence

untrustworthiness (noun)	untrustiness (noun)
the trait of not deserving trust or confidence	the trait of not deserving trust or confidence