holdout
noun [ C ] uk/ˈhəʊld.aʊt/ us/ˈhoʊld.aʊt/
顽固坚持者，拒不妥协者
a person, organization, or country that continues to do something, despite other people trying to force them not to
It's time to shame holdouts into signing the treaty. 现在时机到了，应该让顽固分子感到羞愧而签署条约。