The antonyms for "good-tasting" would be anything that implies that the food does not taste good. Some possible antonyms for "good-tasting" may include tasteless, bland, unappetizing, unpalatable, unsavory, foul, rancid, and bitter, among others. These words are often used to describe food that lacks flavor or is simply unpleasant to eat. In contrast, the word "good-tasting" suggests that the food is enjoyable, delicious, and satisfying to the senses. When selecting food or preparing a meal, it is important to consider not only the appearance and nutritional value of the food but also its taste and flavor.