hard-bitten

这位身经百战的老兵对任何困难都面不改色。

The ___hard-bitten veteran remained unfazed by any challenge.

这位坚韧不拔的记者从不被挑战吓倒。

The ___hard-bitten journalist never gets intimidated by challenges.

尽管团队多次劝说，这位固执的教练依然坚持他的训练方法。

Despite repeated advice from the team, the ___hard-bitten coach insisted on his training methods.