Synonyms and related words :
bitter, disagreeable, dislikable, displeasing, distasteful, sour, thankless, ugly, unalluring, unappetizing, unattractive, undelectable, undelicious, undesirable, unengaging, unenjoyable, uninviting, unlikable, unpalatable, unpleasant, unpleasing, unsavory, untasteful, unwelcome