synergistic adj. + Add to list US //ˌsɪnɝˈdʒɪstɪk// UK //sˌɪnədʒˈɪstɪk// syn·er·gis·tic SynonymsAntonymsEtymology Synonyms interactivesynergetic Antonyms antagonisticOrigin From synergy + -istic.