unthankful

from 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}]