uncompromising has 2 distinct synonyms spread across 1 of its 1 sense. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is compromising.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
not making concessions
“took an uncompromising stance in the peace talks”
Synonyms, antonyms and the broader and narrower relations for uncompromising come from Princeton University’s WordNet. Full sources and licences.