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нечаянный adj. stresses
gen.	unexpected; accidental; casual; inadvertent; unconscious; unwitting; unwitting (о поступке); unintentional (Franka_LV); chance; designless; estray; fortuitous; incident; incidental; stray; unhoped; unlooked for; unthought of
Gruzovik	sudden
Игорь Миг	undreamt-of
obs.	inopinate; unheedy
нечаянно adv.
gen.	by accident; unawares; accidentally; carelessly; unwittingly (kutsch); unintentionally (Арнольдыч); unaware; by mistake (Andrew Goff); inadvertently (bigmaxus); through inadvertence (Ремедиос_П); by oversight
amer., inf.	on accident (Баян)
obs.	unwares
scottish	ablins

нечаянный : 56 phrases in 15 subjects

Astronautics	1
Aviation	2
Figure of speech	1
General	22
Idiomatic	3
Informal	3
Jargon	1
Law	1
Makarov	7
Medical	3
Nautical	2
Obsolete / dated	1
Religion	1
Slang	7
Vulgar	1