unappreciated
1. [ adjective ] not likely to be rewarded
Synonyms: ungratifying thankless
Examples:

"grading papers is a thankless task"

Related terms: unrewarding
2. [ adjective ] having value that is not acknowledged
Synonyms: unvalued unsung
Related terms: unacknowledged
Similar spelling:   unappreciative
  unprotected
  unappreciatively
  unparented
  unpractised
  unpracticed
  unperceived
  unprotective
  unprotectedness
  unprincipled
  unperceivable
  unapprehensive
  unprocessed
  unprompted
  unbarreled
  unpredicted
  unbarrelled
  unappareled
  unprecedented
  unapparent