uneven has 4 distinct synonyms spread across 3 of its 5 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 even.
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 even or uniform as e.g. in shape or texture
“an uneven color”
(of a contest or contestants) not fairly matched as opponents
“vaudeville...waged an uneven battle against the church”
not divisible by two
lacking consistency
“the golfer hit the ball well but his putting was spotty”
1 of the 5 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for uneven.
Synonyms, antonyms and the broader and narrower relations for uneven come from Princeton University’s WordNet. Full sources and licences.