竭力 (jié lì): Spare no effort / do one's utmost (Adverb) — Meaning & Stroke Order

He did his utmost to conceal his inner unease, but his trembling voice gave him away.

Didn't you spare no effort to dissuade him from making that impulsive decision?

He did not do his utmost to seize this opportunity, and therefore regrettably failed to be selected in the end.

In order to reach a settlement, representatives from both sides spared no effort to communicate and finally signed the agreement.