unappreciation

noun

1. (uncountable)Lack of appreciation; failure to appreciate; ingratitude.

   “To delve in an ongoing exploration of this action is to convey unappreciation for a "true expression of gratitude" and may lead the giver to feelings of shame...”

   “Music unappreciation: A new book by Lawrence Kramer laments the dwindling enthusiasm for classical music and examines what could be lost.”