abhorrent, annoying, bitter, bothersome, disagreeable, disappointing, disheartening, dislikable, dissatisfactory, distasteful, foul-tasting, had, ill-flavored, inadequate, incommensurate, insufficient, intolerable, irksome, mislikable, not good enough, odious, rotten, sour, thankless, ugly, unalluring, unappealing, unappetizing, unattractive, uncongenial, undelectable, undelicious, undesirable, unengaging, unenjoyable, unfulfilling, ungratifying, unhappy, uninviting, unlikable, unlovable, unpalatable, unpleasant, unpleasing, unsatisfactory, unsatisfying, unsavory, untasteful, untasty, unwelcome, vexing