ungrateful

adj

1. Not grateful; not expressing gratitude.

   “Near-synonyms: unappreciative, unthankful”

   ““It seems to delight you to think that you are to leave Paris, and that we shall not see each other for months, perhaps. Tarzan, you are a most ungrateful beast!” and D’Arnot laughed.”

2. Disagreeable, repellent, unpleasant.

   “If any care for what is here ⁠Survive in spirits render’d free, ⁠Then are these songs I sing of thee Not all ungrateful to thine ear.”

noun

1. A person who fails to show gratitude; an ingrate.