steely

The negotiator maintained a steely resolve, refusing to back down until all their demands were met.

(Chinese) 谈判代表保持着钢铁般的决心，拒绝让步，直到所有要求都得到满足。

He looked out at the steely grey sky, sensing that a heavy snowstorm was about to begin.

(Chinese) 他望着铁灰色的天空，感觉到一场暴风雪即将开始。