se·di·tious \-shəs\adjective Etymology: Middle English, from Middle French seditieux, from Latin seditiosus, from seditio sedition + -osus -ous 1.: disposed to arouse or take part in or guilty of sedition : factious, turbulent < a seditious agitator > 2.: of, relating to, of the nature of, or tending to excite sedition < the punishment of seditious utterances — J.L.O'Brian > Synonyms:see insubordinate