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необоснованный adj. stresses
gen.	unfounded (not based on facts or reality • The rumours are completely unfounded); baseless (without foundation or reason • a baseless claim); causeless; unsound; ill-founded; unreasonable; bottomless; insupportable; precarious; without validity; foundationless; proofless; unreasoned; rootless; unsubstantiated; wanton; ungrounded; ill founded; arbitrary; without merit (иногда подходит Tanya Gesse); unconscionable (Taras); DOA (Даниил84); untenable; illegitimate; improper (Stas-Soleil); warrantless (напр., арест scherfas); lacking in substance (Alexander Demidov); null and void (Viola4482); exorbitant (Igor Kondrashkin); invalid; motiveless (kee46); groundless (without reason • Your fears are groundless); unforced (unforced policy errors nadin_k); non-justified (Johnny Bravo); misplaced (Abysslooker); unevidenced (Anglophile); offset
Игорь Миг	unhelpful; ill-advised; unjustifiable
busin.	gratuitous
comp., MS	invalid (Pertaining to statements, allegations or arguments that are untrue because not based on fact or sound reasoning)
construct.	groundless (напр., о претензии); unfair
econ.	counterintuitive (As markets may display many characteristics of a competitive environment, intervention may seem counterintuitive. A.Rezvov)
law	inconsistent; insufficient; unjustified; unwarranted; unsound in principle (алешаBG); meritless (New York Times Alex_Odeychuk); frivolous (о ходатайстве, заявлении; источник – clck.ru dimock); conclusory (Некрасова Т. П. Юридический перевод. – М.: Р.Валент, 2012. – С. 213. Leonid Dzhepko)
law, Makarov.	frivolous (об иске и т.п.)
Makarov.	idle; insubstantial; unbottomed; wild; weak
math.	imaginary; off-base; wrong
media.	gratuitous (о сценах секса или насилия в кинофильмах • A lot of viewers complained that there was too much gratuitous sex and violence in the film. Too much and unnecessary.)
notar.	unproven (acertijo)
psychol.	reasonless
railw.	false
tech.	unfounded
необоснованно adv.
gen.	groundlessly; upon the slimmest of evidence; gratuitously; baselessly (zeeeee); without a reasonable basis (Samura88); for no good reason (4uzhoj); improperly (Stas-Soleil); ungroundedly (VLZ_58); unduly (raf); ambiguously; indefinitely; unfairly (Abysslooker); unjustifiably (Zolushka); indefinably; precariously (Aly19)
Игорь Миг	in an unjustifiable manner
EBRD	unreasonably (AD); unreasonably
law	unfoundedly
mach.	without a reason (об изменении параметров translator911)

необоснованный : 452 phrases in 52 subjects

Accounting	1
Advertising	12
American usage, not spelling	2
Artificial intelligence	2
Australian	1
Aviation	1
Banking	1
Business	20
Cardiology	1
Chess	1
Computers	1
Construction	1
Criminal law	8
Diplomacy	10
Ecology	3
Economics	11
Electronics	1
Employment	1
Energy industry	7
European Union	1
Figure of speech	2
Finances	1
Football	1
General	163
Informal	8
Information security and data protection	1
Labor law	1
Latin	1
Law	100
Librarianship	1
Logic	1
Makarov	32
Mass media	2
Mathematics	4
Medical	2
Military	6
Mining	1
Patents	7
Politics	6
Production	2
Programming	2
Psychology	5
Quality control and standards	1
Research and development	1
Rhetoric	2
SAP	1
Scientific	6
Taxes	1
Technology	2
Vulgar	1
Weapons and gunsmithing	1
Wood processing	1