The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
- Not feeling or exhibiting gratitude, thanks, or appreciation.
- Not agreeable or pleasant; repellent: “I will not perform the ungrateful task of comparing cases of failure” (Abraham Lincoln).
- un·grateˈful·ly adverb
- un·grateˈful·ness noun