the.com/ungrateful
The art of receiving everything and acknowledging nothing.
means Failing to feel or show thanks for kindness, gifts, or help received.
from From Latin gratus, pleasing or thankful, the same root that gives us grace, gratitude, and gratis. Slap on the negating un- and you get the warm word turned cold.
Shakespeare's stingHe called ingratitude a marble-hearted fiend.
Sibling wordGratis means free, no thanks expected.
Original senseOnce also meant simply unpleasant or disagreeable.