thankless, adj.
not feeling or showing gratitude
<adj.all> freq. cnt.: 1 freq. cnt.: 1
thankless ungrateful unthankful
sample sentences
"ungrateful heirs""How sharper than a serpent's tooth it is / To have a thankless child!"- Shakespeare
semantic pointers
similar to
not likely to be rewarded
<adj.all>
thankless unappreciated ungratifying