reject has 16 distinct synonyms spread across 7 of its 8 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 2 recorded opposites are accept, admit.
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.
dismiss from consideration or a contest
“John was ruled out as a possible suspect because he had a strong alibi”
the person or thing that is rejected or set aside as inferior in quality
Synonyms, antonyms and the broader and narrower relations for reject come from Princeton University’s WordNet. Full sources and licences.