What is another word for "envenom"?

Roget's Thesaurus (1911) lists these synonyms for "envenom": add, aggravate, aggravating, aggravation, and, bad, deteriorate, embitter, enrage, exacerbate, exacerbation, exaggeration, exasperate, exasperation, excite, fan, fire, flame, from, frying, fuel, heighten, into, much, out, pan, provoke, render, sour, tease, the, worse.