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gen.
complex ; compound ; elaborate ; involved ; tricky ; perplexed ; daedal ; inextricable ; involute ; knotty ; multiplex ; sinuous ; trick ; multiple ; decomposite ; multiplicate ; operose ; woofed ; Byzantian ; Gordian ; esoteric ; knotted ; profound ; tangly ; sensitive (pau4icca ) ; boffinated (Svetlana D ) ; ambitious (tavost ) ; problematic (MargeWebley ) ; curlicue ; far out ; trickish ; Byzantine ; sinuated ; fancy (MariaDroujkova ) ; hard to understand ; labyrinthine (Ремедиос_П ) ; hard-hitting (she was not prepared for the hard-hitting questions the reporters had in store at the press conference SirReal ) ; intricate ; anfractuous ; plexiform ; composite ; sophisticated (о приборе, машине, системе и т. п.) ; compositive ; tough (a tough question – сложный вопрос Weedy Star ) ; dense (suburbian ) ; complicated ; challenging (требующий усилий Anastasia_E ) ; arcane (понятный знатокам Марчихин ) ; curly (о проблеме Bartek2001 ) ; overwhelming (с которым трудно справиться. контекстуальный перевод Ремедиос_П ) ; snarly ; decompounded ; high-level (sankozh ) ; baroque (VLZ_58 )
Игорь Миг
fraught with problems ; fraught with obstacles
astronaut.
material
austral., slang
hairy ; mongrel (проект, работа и т.п.)
book.
Daedalian ; Daedalean ; Dedalian ; mandarin (marked by polished ornate complexity of language "I don't think there's anything about the novel that doesn't impress me: its stream of satirical invention…; its mandarin prose that perfectly conjures the trancelike drift of a modern consciousness overwhelmed by detail; and its breathtaking risks with structure…." – Alan Moore, quoted in The International New York Times, 10 Sept. 2016 VLZ_58 )
cem.
perplex
comp.
multiaspect
construct.
mixed ; complicated (напр., о строительных работах) ; sophisticated
dipl.
troublesome
dril.
blended ; combined ; component
el.
hirsute ; rough (напр. о проблеме)
fig.
over one's head (If you get stuck in a situation that's a bit over your head, call upon your best acting abilities to bluff your way through it. VLZ_58 ) ; prickly (Nuclear defense policy is bound to be one of the prickliest issues at the party conference. VLZ_58 ) ; fractious (fractious relationship joyand ) ; vermiculate (Andrey Truhachev )
forestr.
multi-storeyed
geol.
aggregate
hydrobiol.
colonial
inf.
far-out
lat.
compositus (Lena Nolte )
ling.
complex (о слове)
Makarov.
built-up ; composition ; deep ; formidable ; implex ; multiple (напр., о линзах) ; tangled ; convoluted (very complicated and difficult to understand Val_Ships )
math.
entangled
med.
problem
media.
animation compound ; challenging ; laminated (о структуре)
mil.
sophisticated (об оборудовании)
mil., tech.
elaborate (о системе)
modern
arduous (тяжёлый Alex_Odeychuk )
plast.
compounded (slick59 )
pmp.
hard-to-do (translator911 )
polit.
complicated (трудный) ; запутанный intricate ; составной compound
progr.
advanced (ssn )
psychol.
complicated (для понимания, объяснения, решения)
railw.
complicate ; elaborated ; multiple belting
scottish
wimpled
seism.
polyharmonic
slang
rugged
tech.
difficult ; sophistic (Annato )
gen.
complexity ; complicacy ; complicity
gen.
is involved (Прим.: the problem is far involved – эта проблема слишком сложна DagerD )
chem.
conjugated proteins
gen.
is involved (DagerD )
telecom.
trickier (oleg.vigodsky )