Definition of "ghoulish"

Ay, even the droll humour and solidity of Khalid, are shaken, aroused, by the ghoulish greed, the fell inhumanity of these sharpers.

1910 January 12, Ameen Rihani, “Via Dolorosa”, in The Book of Khalid, New York, N.Y.: Dodd, Mead and Company, published October 1911, book the first (In the Exchange), page 29

We had that afternoon dug a grave in the cellar, and would have to fill it by dawn -- for although we had fixed a lock on the house, we wished to shun even the remotest risk of a ghoulish discovery.

1922, H. P. Lovecraft, Herbert West: Reanimator‎