seditious adj. + Add to list US //sɪˈdɪʃəs// UK //sɛdˈɪʃəs// sedi·tious SynonymsEtymology Synonyms incendiaryincitiveinflammatoryinstigativeinsurgentrabble rousingsubversiveOriginLATseditiosus→FRMséditieux→ENseditious From Middle French séditieux, from Latin seditiosus.