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неправдоподобный adj. stresses
gen.	untanable; unbelievable (malagnana); incredible; improbable ("Young man," he said, "upon this point I can only say that your story is grossly improbable. It won't hold water."); anecdotic; fabulous; steep; unlikely (an unlikely story); unthinkable; uncreditable; unplausible; impossible; farfetched (xenkis); larger-than-life (Anglophile); ludicrous (Tanya Gesse); increditable (Допустимо как increditable так и uncreditable Sin21); far-fetched (extremely unlikely to be true or to happen Senior Strateg); unlike; wide of truth
Gruzovik	untenable
Игорь Миг	grotesque; undreamed-of
amer.	out-of-this-world (figure of speech Val_Ships)
fig.of.sp.	fat-fetched (great_manul)
inf.	steep (о рассказе); steeper (о рассказе); fishy
law	infeasible
libr., amer., slang	fish-story
math., logic	implausible
prop.&figur.	ridiculous (Vadim Rouminsky)
seism.	unlikely
что-либо неправдоподобное adj.
gen.	reach (peacemaker)
неправдоподобно adv.
gen.	incredibly; fabulously; unbelievably ('More); unlikely
Gruzovik	improbably; implausibly
Игорь Миг	mind-bogglingly
inf.	out there (It sounds pretty out there, but experts say... joyand)
slang	fishy

неправдоподобно: 80 phrases in 20 subjects

American usage, not spelling	2
Business	1
Finances	1
General	37
Idiomatic	4
Informal	3
Information technology	1
Librarianship	4
Makarov	9
Mathematics	3
Nuclear and fusion power	1
Obsolete / dated	1
Philosophy	1
Physics	1
Polygraphy	1
Psychiatry	2
Rhetoric	2
Scientific	2
Slang	3
Vulgar	1