Synonyms and related words :
bitter, disagreeable, dislikable, displeasing, distasteful, flat, flavorless, foul-tasting, ill-flavored, insipid, savorless, sour, tasteless, thankless, ugly, unalluring, unappealing, unattractive, undelectable, undelicious, undesirable, unengaging, unenjoyable, uninviting, unlikable, unpalatable, unpleasant, unpleasing, unsavory, untasteful, untasty, unwelcome