极力 (jí lì): With all one's might (Adverb) — Meaning & Stroke Order

Despite facing many doubts, he still defended his innovative ideas with all his might.

He tried his best to explain why he was late, but the teacher still got angry.

He tried his utmost to avoid discussing his family's private matters in public.

I tried my utmost to persuade him to change his mind, but his attitude was very firm.