inopportuneness vs untimeliness

inopportuneness and untimeliness both are nouns.

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

As nouns, inopportuneness and untimeliness are synonyms defined as:

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

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