Bonne bouche is a French term that translates to "appetizer" or "delicacy" in English. While there are no direct antonyms for this phrase, there are several words that could be used in its place to convey a different meaning. For example, if you wanted to express distaste or disgust, you might use words like "offensive," "repulsive," or "repugnant." On the other hand, if you wanted to describe something plain or unappetizing, you might say it's "bland," "dull," or "uninspiring." Ultimately, the choice of word depends on the context and the intended message you want to convey.