Synonyms of infectious

2 Syllables
toxic, noxious, taking, miasmic, catching
3 Syllables
poisoning, corrupting, diseased, mephitic, pestilent, defiling, contagious, vitiating, virulent, polluting
4 Syllables
epizootic, impartible, pestilential, transmissible, pestiferous, epidemic, transmittable, transferable, infective
5 Syllables
inoculable, communicable, contaminating