pertinacious

尽管遭到家人反对，他仍然坚持自己创业的决定。

Despite his family's objections, he remained ___pertinacious in his decision to start a business.

这位顽强的科学家花了二十年为自己的假说收集证据，尽管一直受到同行的嘲笑。

The ___pertinacious scientist spent twenty years gathering evidence for her hypothesis despite being mocked by peers.

律师固执的交叉盘问最终揭示了证人的矛盾之处。

The lawyer's ___pertinacious cross-examination eventually revealed the witness's inconsistency.