Antonyms for the word "antibacterial" refer to substances that do not have the ability to combat bacteria. One such antonym is "probiotic," which promotes the growth of good bacteria in the body. Other antonyms include "unsanitary," "dirt," and "filth," which actually provide an ideal breeding ground for bacteria. "Natural" and "organic" can also be considered antonyms for "antibacterial," as they refer to substances that occur naturally and are not designed to kill bacteria. It's important to note that while antonyms for "antibacterial" may not directly fight bacteria, they may have other positive effects on the body and overall health.