Septically is an adverb that describes something being done in a way that is infected with harmful bacteria. There are several synonyms for the word that can be used in its place to convey a similar meaning. These include putridly, rottenly, foully, and disgustingly. Other synonyms for septically that can be used in specific contexts include contagiously, infectiously, and germinally. Each of these words can bring different nuances to the sentence, so it's important to choose the one that best fits the intended context and tone of the writing.