nonjudgmental has no recorded synonym. 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 judgmental.
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.
refraining from making judgments especially ones based on personal opinions or standards
“sympathetic and nonjudgmental”
Synonyms, antonyms and the broader and narrower relations for nonjudgmental come from Princeton University’s WordNet. Full sources and licences.