untimeliness vs inopportuneness

untimeliness and inopportuneness both are nouns.

Word	Noun	Adjective	Verb	Adverb
untimeliness	Yes	No	No	No
inopportuneness	Yes	No	No	No

As nouns, untimeliness and inopportuneness are synonyms defined as:

untimeliness and inopportuneness: the quality of occurring at an inconvenient time

untimeliness (noun)	inopportuneness (noun)
the quality of occurring at an inconvenient time	the quality of occurring at an inconvenient time
being at an inappropriate time