Not feeling or exhibiting appreciation:
Not agreeable or pleasant; repellent:
Not having risen in price or value:
The definition of grateful is feeling or showing thanks or appreciation for something.
Not showing or feeling gratitude
Find another word for unthankful. In this page you can discover 6 synonyms, antonyms, idiomatic expressions, and related words for unthankful, like: unappreciative, ungrateful, thankless, unappreciated, grateful and unthanking.