Not feeling or exhibiting gratitude, thanks, or appreciation. (adjective)
Not agreeable or pleasant; repellent: "I will not perform the ungrateful task of comparing cases of failure” ( Abraham Lincoln). (adjective)
Examples of word ungrateful
Now the DPM shooting his cannon at the what he call ungrateful Chinese.
Nor was Martin ungrateful, knowing as he did the lives of the poor, and that if ever in the world there was charity, this was it.
Themistokles was banished, and chafing at the treatment he had received, he was encouraged to ask him to share his treason, and showed him the letters which he had received from the Persian king, at the same time inflaming his resentment against the Greeks, whom he spoke of as ungrateful wretches.
Yet in same breath, adoptees are called "ungrateful" just for wanting to meet, even once, their moms and dads.
Itthe arabic word comes from the root word "ungrateful" and as such, means someone who has fully understood the guidance given by God and is "ungrateful"---chosen to reject it.