holdout
noun [ C ]
uk/ˈhəʊldaʊt/ usa person, organization, or country that continues to refuse to accept something that others have already accepted, despite other people trying to persuade them to:
Smaller producers, who would receive less than 20% of the $1.2 billion under the settlement formula, remain holdouts.
the act of refusing to accept something:
Their holdout continued as they refused to sign the contract.