uncritical has 1 distinct synonym spread across 1 of its 2 senses. 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 critical.
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.
marked by disregard for critical standards or procedures
“news sources reflected uncritical estimates of the number of juvenile addicts”
not critical; not tending to find or call attention to errors
“a devoted and almost uncritical admirer”
Synonyms, antonyms and the broader and narrower relations for uncritical come from Princeton University’s WordNet. Full sources and licences.