Synonyms of infective

2 Syllables
septic, toxic, noxious, miasmic, catching
3 Syllables
poisoning, corrupting, diseased, mephitic, infectious, toxicant, poisonous, pestilent, defiling, contagious, vitiating, virulent, polluting
4 Syllables
epizootic, pestilential, epidemic, transmittable, transferable, mephitical
5 Syllables
communicable, contaminating