Not appealing or attractive to the taste or appetite. The unappetizing meal left everyone at the table feeling disappointed.
Lacking in visual appeal, often making something seem less desirable to eat. The unappetizing color of the soup made it difficult for anyone to want to try it.
Unpleasant or unattractive in a broader, often figurative sense, not necessarily related to food. The report presented some unappetizing facts about the company's finances.