adjective
- Not feeling or showing gratitude."ungrateful heirs"; "How sharper than a serpent's tooth it is / To have a thankless child- Shakespeare
- synonyms: thankless, unthankful
- Disagreeable. "I will not perform the ungrateful task of comparing cases of failure- Abraham Lincoln
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). Ungrateful. Retrieved September 23, 2026, from http://smartdefine.org/ungrateful/definitions/1186691 |
| Chicago | WordNet. 2010. "Ungrateful" http://smartdefine.org/ungrateful/definitions/1186691 (accessed September 23, 2026). |
| Harvard | WordNet 2010, Ungrateful, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/ungrateful/definitions/1186691>. |
| MLA | WordNet. "Ungrateful" 23 October 2010. Web. 23 September 2026. <http://smartdefine.org/ungrateful/definitions/1186691> |