inactivate v. + Add to list US //ˌɪˈnæktɪˌveɪt// UK //ɪnˈæktɪvˌeɪt// in·ac·ti·vate SynonymsAntonymsEtymology Synonyms deactivatedemobilize Antonyms activatemobilizeOrigin From inactive + -ate (verb-forming suffix) or in- + activate.