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не сомневаться stresses
gen.	make no bones; make no bones about; make no question of; make no doubt; without doubt; rely (4uzhoj); beyond a doubt; have every confidence (that Alexander Demidov); be positive about something (в чём-либо Taras); be past a doubt; keep the faith
busin.	be assured (Johnny Bravo)
inf.	bet one's boots; absolutely think (Technical)
Makarov.	make no bones of; make no enquiry of
slang	bet one's boots
не сомневайся
gen.	make no mistake (about something: I'll go to the police next time – make no mistake about it. • It commands a premium price, but make no mistake: this is a truly premium phone. 4uzhoj); rest assured (Taras); count on it ("We can talk about it when you're back on your feet again". "Count on it!" Побеdа)
не сомневаюсь
gen.	I'm sure (ekirillo)
ironic.	I suppose so (Abysslooker)
не сомневайтесь
gen.	be sure of something (scherfas); make no mistake (Ivan Pisarev)
не сомневаюсь!
inf.	I bet! (Фраза переводится разными вариантами, в зависимости от контекста. Franka_LV)
slang	youbetcha (Nata Shkoda)
не сомневайтесь!
gen.	you bet (Дмитрий_Р)

не сомневаться: 149 phrases in 14 subjects

American usage, not spelling	1
Business	1
Chess	1
Cliche / convention	2
General	86
Idiomatic	7
Informal	6
Makarov	31
Mathematics	2
Proverb	4
Rhetoric	2
Scientific	2
Slang	3
Vulgar	1