conviction has 5 distinct synonyms spread across 2 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 acquittal.
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.
an unshakable belief in something without need for proof or evidence
(criminal law) a final judgment of guilty in a criminal case and the punishment that is imposed
“the conviction came as no surprise”
Synonyms, antonyms and the broader and narrower relations for conviction come from Princeton University’s WordNet. Full sources and licences.