Foul-tasting is a term used to describe food or drink that has an unpleasant taste. It can be described as NASTY, skunky, or VILE. NASTY is a five-letter word meaning very unpleasant or offensive. Skunky is a six-letter word meaning having a strong, unpleasant smell. VILE is a four-letter word meaning extremely unpleasant or offensive. All three words are used to describe the same thing - something that tastes bad.