unappreciative
1. [ adjective ] not feeling or expressing gratitude
Examples:

"unappreciative of nature's bounty"

Related terms: ungrateful
Similar spelling:   unappreciatively
  unappreciated
  unprotective
  unperceptive
  unapprehensive
  unperceived
  unprovocative
  unperceptiveness
  unperceivable
  unproductive
  unpredictive
  unpractised
  unpracticed
  unproductively
  unprotected
  unprincipled