After-tastes refer to the persistent taste or flavor left in the mouth after eating or drinking. The antonym for after-tastes is pre-taste, which refers to the initial flavor or taste that one perceives when they start to eat or drink. Another antonym for after-tastes is neutral flavor, which refers to the absence of any distinct or lingering taste. So, if you want to avoid the unpleasant after-taste of your food or drink, you can opt for something with a neutral flavor or savor the pre-taste to enjoy the initial flavor without worrying about what may come after.