adjective
a word that describes or modifies a noun or pronoun, in this case, 'unappreciative' describes someone who does not show gratitude or recognition
-
She was unappreciative of the effort her team put into the project.
-
He's so unappreciative of everything I do for him.
-
My friend can be really unappreciative sometimes, it's annoying.
-
The unappreciative soil refused to yield any crops despite the farmer's hard work.