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ничтоже сумняшеся stresses
arch.	without second thought (Vadim Rouminsky)
Gruzovik, humor.	without thinking for a second; on the spur of the moment; unhesitatingly
idiom.	nothing doubting; without doubting for a moment (Anglophile); without a moment's hesitation (Anglophile); without a qualm (lesdn); unabashedly (Vadim Rouminsky); without even a slightest thought about consequences (4uzhoj); without even a slightest bit of self-criticism (4uzhoj); doubtlessly (говорить или делать что-либо sashkomeister); at face value (Abysslooker); without a second thought (Abysslooker)
inf.	just like that
obs.	unabashed (Tsa'tuyo)