decriminalize v. + Add to list US //diˌkɹɪmənəˈɫaɪz// de·crim·i·nal·ize SynonymsAntonymsEtymology Synonyms legalizelegitimatelegitimatiselegitimatizelegitimize Antonyms outlawOrigin Back-formation from decriminalization, equivalent to de- + criminalize.