Synonyms to unthankful

thankless, bitter, bootless, careless, despised, disagreeable, dislikable, disliked, displeasing, distasteful, fruitless, futile, heedless, lowly, miserable, misprized, misunderstood, out of favor, profitless, self-centered, sour, thoughtless, ugly, unacknowledged, unalluring, unappealing, unappetizing, unappreciated, unappreciative, unattractive, uncared-for, undelectable, undelicious, undesirable, unengaging, unenjoyable, ungrateful, uninviting, unlamented, unlikable, unmindful, unmissed, unmourned, unpalatable, unpleasant, unpleasing, unpopular, unprofitable, unregretted, unrequited, unrewarding, unsavory, unsung, untasteful, unvalued, unwelcome, useless, vain, wretched, against, con, disappointed, disapprobatory, disapproving, discontented, disenchanted, disgruntled, disillusioned, displeased, dissatisfied, dissenting, indignant, low, opposed, opposing, poor, turned-off, unapproving, uncomplimentary, unfavorable, unhappy, Lethean, a stranger to, absentminded, airy, aloof, amnestic, apathetic, asleep, ataractic, blase