Synonyms for Inopportuneness:

n.

attribute (noun)
untimeliness.
awkwardness (noun)
inconvenience, untimeliness.
untimeliness (noun)
inconvenience, tardiness, prematurity, infelicity, delinquency, lateness, inauspiciousness, untimeliness, inexpedience.

Other synonyms:

n.
untimeliness.