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не раздумывая ударения
общ.	bald-headed; off hand; on the spur of the moment (Anglophile); without a moment's hesitation (Anglophile); off the reel (Anglophile); right off the reel (Anglophile); straight off the reel (Anglophile); offhandedly (Andrey Truhachev); unhesitantly (Рина Грант); lightly (Andrey Truhachev); without thinking twice (driven); off the top of one's head (He answered the questions off the top of his head); straight out (without thinking Andrey Truhachev); harshly (Aly19); unthinkingly (Andrey Truhachev)
Игорь Миг	any day
амер.	not thinking twice (about Val_Ships); without missing a beat (Val_Ships); off the cuff (I could give an opinion off the cuff, but I'd rather think about it. Val_Ships)
идиом.	out of hand (The offer was so good that I accepted it out of hand. goorun)
книжн.	with nary a thought (Халеев)
Макаров.	like a shot
разг.	on the fly (without preparing and without thinking too much: She was the sort of person who would make decisions on the fly rather than allowing herself time to think. Val_Ships)
не раздумывать
общ.	not think twice (The victim says she didn't think twice about running after the man. She immediately got up and starting chasing her assailant. ART Vancouver)

не раздумывая: 15 фраз в 5 тематиках

Макаров	8
Общая лексика	4
Переносный смысл	1
Разговорная лексика	1
Сленг	1