1、I would unhesitatingly choose the latter option.
我會毫不猶豫地選第二個選項。

2、Realizing there was nothing for him to do to save his plane, the pilot unhesitatingly baled out.
飛行員意識到自己已無力挽救飛機，便毫不猶豫地跳了傘。

3、Upon seeing a kid falling into the lake, he unhesitatingly plunged in with his clothes on.
看見一個小孩兒掉進湖里，他連衣服都沒脫就毫不猶豫地扎了進去。