adj.not feeling or expressing gratitude

"unappreciative of nature's bounty"

Unappreciative
Americans Say Iraqis Unappreciative of Favors
Tate's unappreciative beneficiaries
Comparative Study on the Attitudes of Unappreciative Superior and Subordinate Performance in Hospitality Industry
April’s Fool covers a few hours in the life of an unappreciative farmer and his downtrodden wife. After a stomach-churning dinner s...
To Tell The Truth: Black police become unappreciative coloreds
This Time Bills Can Hurt Unappreciative Steelers
A Pair of Unappreciative Children
Apparatus and method for determining a position of a patient in a medical examination
Max Shachtman: The Problem of the Labor Party (March 1935)