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сомневаюсь v stresses
gen.	I doubt it (Is that going to happen? I doubt it. ART Vancouver); my ass
сомневаюсь! v
gen.	I wonder!
сомневаться v
gen.	demur; mistrust; stickle; vibrate; misdoubt; stumble at; disbelieve; boggle; hesitate; waffle; wonder; dispute (в чём-либо); stumble; swing in the balance; be in two minds (Aly19); give no credence (Valeriy Morkva); have some doubts (I have some doubts about the mayor's new tax policy. ART Vancouver); jib at; make doubt; second-guess (to criticize or correct, often by hindsight, by presuming to have a better idea, method, etc. marina_aid); not to know if one is coming or going; have trouble (не решаться что-то сделать pivoine); question (Alexander Demidov); debate (I have always debated whether to write this post or not. Moscowtran); have doubt; scruple; go back and forth on an issue (jouris-t); be of two minds (jouris-t); distrust; be in a state of uncertainty; jib (в чём-либо); query (Andrey Truhachev); be in doubt; be in two minds (в чём-либо – about something Anglophile); be reluctant (be reluctant to do something-сомневаться в том, что что-либо следует делать Tanya Gesse); challenge; anticipate; question; doubt (with в + prepl. or a dependent clause); entertain doubts
Gruzovik	doubt; worry
Игорь Миг	be skittish about; be a fence-sitter
busin.	dispute
dipl.	dispute (в чём-либо)
fig.	have doubts (Damirules)
idiom.	be on the fence (I think this is perfect for trying a smartwatch experience and if you are on the fence, go for it. 4uzhoj)
inf.	be hazy about
IT	suspect
Makarov.	hang in the balance; be in doubt; call in question; call into doubt; call into question; be hesitating; be in the balance; be in two minds (когда речь идёт о практических делах); boggle about; boggle at; boggle over; doubt one's own senses; have one's doubts about (в); have scruples; jib at (в чём-либо); tremble in the balance
math.	be doubtful of
obs.	diffide; dubitancy; scepticize (во всём)
slang	hedge; hedge off; scully (глагол произошёл от фамилии главной героини телесериала "Секретные материалы" Даны Скалли sixthson); be not sure (Damirules)
uncom.	dubitate
сомневаясь v
gen.	doubtingly; hesitantly

сомневаюсь : 521 phrases in 30 subjects

American usage, not spelling	1
Business	3
Chess	1
Cliche / convention	3
Contextual meaning	1
Diplomacy	7
Economics	1
General	325
Idiomatic	12
Informal	18
Insurance	1
Ironical	2
Law	1
Makarov	101
Mass media	2
Mathematics	6
North American USA and Canada	1
Obsolete / dated	1
Philosophy	2
Polite	2
Production	1
Proverb	8
Quotes and aphorisms	1
Rhetoric	6
Sarcastical	1
Scientific	4
Slang	5
Telecommunications	2
Transport	1
Vulgar	1