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Definition of thankless:

  1. Not acknowledging favors; not expressing thankfulness; unthankful; ungrateful.
  2. Not obtaining or deserving thanks; unacceptable; as, a thankless task.

Synonyms:

bad, rude, objectionable, ingratitude, bleak, unvalued, unpleasant, unthankful, profitless, churlish, take someone for granted, ungratifying, harsh, barren, cruel, self-centered, unthanking, disagreeable, grateful, hard, useless, unsung, repay, vain, unappreciative, unrewarding, ungrateful, awful, ungracious, unappreciated, unappealing, unattractive.

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