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несущественный adj. stresses
gen.	insubstantial (Social media is another publishing platform, and as a person who produces content that is published, social media was another outlet for me. I could publish mini-takes, things too short or insubstantial for a column or a segment of television vogeler); accidental; of no consequence; immaterial; unessential; dispensable; external; incidental; inconsequent; inconsequential; inessential; insignificant; omissible; unsubstantial; non-essential; unvital; inconsiderable; peppercorn; off the map; extrinsical; minute; slim; informidable (ozzydown); non-material (Alexander Matytsin); insubstantial (Alexander Matytsin); collateral; neglectable (schyzomaniac); episodic; marginal; peddling; nonsignificant; substanceless (Faststone)
Игорь Миг	trifling
adv.	of little consequence
busin.	light; minor; nonessential; unimportant; of negligible importance; little
construct.	negligible
dial.	matterless
dril.	negligible (о малых величинах); null
fig.	frothy; low-stakes (plushkina)
gov.	non-core (о статье расходов, напр., в городском бюджете: "How are they going to fund the extra police and nurses??" "Slashing non-core expenditures. Easy to do as the last three councils did nothing but build up those expenditures. Closing the rental office and ditching VANDU money was a good, albeit tiny, start. Ramp it up." (Twitter)  ART Vancouver)
IT	irrelevant
Makarov.	imperceptible; imponderable; indifferent; tenuous; trivial; valueless; accessary; accessory
math.	inappreciable; incident
mining.	of no consequence to
oil	venial (о дефекте)
product.	no meaningful (Yeldar Azanbayev)
progr.	unnecessary (ssn)
psychol.	extrinsic
qual.cont.	superficial
slang	jerk soup; jerk town; jerk water; penny ante; mickey-mouse ("I'm sick of this mickey-mouse job." Franka_LV)
stat.	not significant (о различии сопоставляемых показателей)
yiddish.	pisher (Noigel)
несущественно adv.
gen.	beside the point (ИВГ); slightly; incidentally; it makes no odds; marginally (Bazhanov)
Gruzovik	accidentally; circumstantially; immaterially
fig.of.sp.	neither here nor there (sea holly)
math.	unessentially
mil., avia.	immaterial
psychol.	circumstantially
scient.	insignificantly (ujin8)
несущественное adj.
gen.	unessential; externals; external; sideshow; extrinsicality; extrinsicalness
vulg.	chicken shit
несущественно! adj.
gen.	a small matter!

несущественный: 260 phrases in 53 subjects

Accounting	2
Advertising	8
American usage, not spelling	2
Audit	1
Automated equipment	1
Aviation	2
Business	3
Clinical trial	1
Common law Anglo-Saxon legal system	1
Computer networks	1
Computers	2
Diplomacy	3
Disaster recovery	3
Economy	4
Electronics	6
European Bank for Reconstruction and Development	3
Food service and catering	2
Forestry	1
General	64
Geology	1
Informal	4
Information technology	3
Law	16
Law enforcement	1
Librarianship	3
Makarov	21
Marketing	1
Mass media	7
Mathematics	35
Mechanics	1
Medical	2
Microelectronics	1
Microsoft	1
Military	2
Notarial practice	1
Oil / petroleum	8
Patents	5
Philosophy	2
Politics	1
Production	1
Programming	6
Psychology	3
Quality control and standards	2
Research and development	3
Scientific	3
Seismology	2
Slang	4
Software	1
Sports	1
Technology	4
Telecommunications	2
Textile industry	1
Welding	1