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некстати adv. stresses
gen.	inopportunely; amiss; neither here nor there; inaptly; mistime; beside the mark; beside the question; off the point; out of turn; at inappropriate times (q3mi4); out of season; not to the point (Anglophile); embarrassingly (There was one time though where I embarrassingly rolled out Sphex); irrelevantly (Андрей Шагин); out of place (kee46); ineptly (kee46); timing is terrible (someone's VLZ_58); apropos of nothing (Sean interrupted our conversation about politics and, apropos of nothing, asked who we thought would win the basketball game. VLZ_58); malapropos; inconveniently (Abysslooker); bad timing (masizonenko); impertinently; ineptly; ill timed; wrong; wrongly; timelessly; at an inopportune moment; out of place; inappropriate; inappropriately; unseasonably
Gruzovik	at the wrong time
Игорь Миг	in the wrong place; out of line
book.	ill-timed ("He saw that his mirth had been ill-timed. He reassembled the features, ironing out the smile." (P.G. Wodehouse) – Он понял, что его веселье пришлось некстати. ART Vancouver)
dipl.	away from the point (bigmaxus); wide off the mark (bigmaxus)
inf.	off the mark (Franka_LV)
Makarov.	away the point; beside the point; far from the mark; from the point; short of the mark; wide of the mark; far beside the mark; far short of the mark; far wide of the mark
obs.	unfitly; unmeetly

некстати: 57 phrases in 7 subjects

Cliche / convention	1
Disapproving	1
General	43
Informal	2
Makarov	6
Obsolete / dated	3
Scottish usage	1