Translation of "Critically" in Japanese

critically challenged my will to keep living.

私の生きる意欲を 致命的にあやうくしました

It is whispered that the Prime Minister is critically ill.

首相は危篤だとささやかれている。

A critically wounded elephant went berserk and attacked every living thing in his path.

ひどい傷を負った象は、興奮し、通る道で出会った生き物という生き物を襲った。

Up to now we've been taking a casual relaxed attitude toward our relationship but I want to start looking at us more critically.

今までは「なーなー」で付き合ってきたけれど、今後は是々非々の立場で付き合うよ。