Synonyms and related words :
afflictive, bitter, disagreeable, dislikable, displeasing, distasteful, flat, flavorless, foul-tasting, galling, grievous, ill-flavored, inedible, insipid, loathsome, matchless, nasty, nauseous, off, offensive, only, painful, peerless, rancid, repugnant, savorless, sickening, sour, tasteless, thankless, thin, turned, ugly, unalluring, unappealing, unappetizing, unattractive, undelectable, undelicious, undesirable, unengaging, unenjoyable, unequaled, uninviting, unique, unlikable, unmatched, unparagoned, unparalleled, unpleasant, unpleasing, unrivaled, unsavory, untasteful, untasty, unwelcome, washy, watery, weak