Douglas Harper's Etymology Dictionary
1834, from un- (1) "not" + appreciative. Related: Unappreciatively; unappreciativeness.
Wiktionary
a. Not appreciative
WordNet
adj. not feeling or expressing gratitude; "unappreciative of nature's bounty"
Usage examples of "unappreciative".
When a woman reacts to a man in an untrusting, rejecting, disapproving, or unappreciative way, he gives minus or penalty points.
Oncle Jazon babbled until satisfied that Beverley was unappreciative, or at least unresponsive.
Sancho, as he curled himself up and affected to turn his back on an unappreciative world.
For example, when your partner disappoints you, you may feel angry that he is being insensitive, angry that she is being unappreciative.
My friend works as a skycap, and on Monday afternoon he saw four men take an American Airlines flight to Quebec, and the reason he noticed them was that, number A, they was very hard-looking dudes indeed, definitely not your Memphis Theological Seminary boys' choir, and, number B, he recognized one of their faces from six or seven years back in the Shelby County Penal Farm, when he himself was serving a small amount of time for rescuing Cadillacs from their unappreciative owners.
In this she had the expert assistance of Miss Hephzibah Cardle, my lady’s own dresser, whose spinsterish form and acidulated countenance could have led no one to suppose that she combined a rare talent for turning her mistress out complete to the last feather with a jealous adoration of that singularly unappreciative lady.
A blue cloud streamed parallel to the long stem, was divided by the bowl, bright as a horsechestnut newly split from its husk, and joined again in lazy assault upon the unappreciative nostrils of Pumphrey, who coughed pointedly and swung his head aside.