thankless Synonyms

ungrateful unthankful unappreciated ungratifying unmourned unacknowledged unpopular unprofitable unceremonious wretched vain useless unvalued unpleasant unenviable unlamented unmindful unrequited unfulfilling unappreciative unrewarding unwelcome inappreciative undesirable unrecognized unsung not appreciative unmannerly ungracious distasteful disrespectful displeasing disagreeable difficult cruel churlish careless bootless bitter barren fruitless futile thoughtless sisyphean self-centered rude profitless obnoxious miserable ingratitude