Wordnet 3.0
ADJECTIVE (1)
1.
not feeling or showing gratitude;
- Example: "ungrateful heirs"- Example: "How sharper than a serpent's tooth it is / To have a thankless child!"- Shakespeare[syn: ungrateful, thankless, unthankful]
The Collaborative International Dictionary of English v.0.48:
Unthankful \Unthankful\
See thankful.
WordNet (r) 3.0 (2006):
unthankful
adj 1: not feeling or showing gratitude; "ungrateful heirs";
"How sharper than a serpent's tooth it is / To have a
thankless child!"- Shakespeare [syn: ungrateful,
thankless, unthankful] [ant: grateful, thankful]