outlaw has 13 distinct synonyms spread across 4 of its 4 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 legalize.
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.
contrary to or forbidden by law
“an illegitimate seizure of power”
someone who has committed a crime or has been legally convicted of a crime
Synonyms, antonyms and the broader and narrower relations for outlaw come from Princeton University’s WordNet. Full sources and licences.