Use the adjective unpalatable to describe something that tastes really bad, like a glass of unsweetened lemonade.

Food is unpalatable if it tastes or smells terrible, but other non-edible things can also be described this way, if just thinking about them makes you cringe. You might find it unpalatable that some people starve while others have much more than they need, for example. Unpalatable is the antonym of palatable, meaning "good-tasting." It all started with the Latin root word palatum, meaning "roof of the mouth."

Definitions of unpalatable

adj not pleasant or acceptable to the taste or mind

“an unpalatable meal”
unpalatable truths”
unpalatable behavior”
unappetising, unappetizing
not appetizing in appearance, aroma, or taste
inedible, uneatable
not suitable for food
unpleasant or disgusting especially to the senses
distasteful and unpleasant; spoiled by mixture
distasteful, unsavory, unsavoury
not pleasing in odor or taste
disagreeable to the senses, to the mind, or feelings
lacking flavor
palatable, toothsome
acceptable to the taste or mind
appetising, appetizing
appealing to or stimulating the appetite especially in appearance or aroma
comestible, eatable, edible
suitable for use as food
pleasing to the sense of taste
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