Adjective unappreciated has 2 senses
  1. thankless, unappreciated, ungratifying - not likely to be rewarded; "grading papers is a thankless task"
    Antonym: rewarding (indirect, via unrewarding)
  2. unappreciated, unsung, unvalued - having value that is not acknowledged
    Antonym: acknowledged (indirect, via unacknowledged)
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