Acidulent is a word used to describe something that has a slightly acidic taste or flavor. The antonyms for the word acidulent are alkaline, basic, sweet, and bland. Alkaline is used to describe something that is opposite in nature to acid, and is more basic or alkaline. Basic and sweet are also antonyms for acidulent, as they portray a more neutral or sweet taste opposite to the acidic taste. Similarly, bland can be used as an antonym for acidulent, as it describes something that has no taste or flavor, very much different from an acidic taste.