adj.不感谢的；忘恩的；吃力不讨好
副词: thanklessly 名词: thanklessness
英英释义
"ungrateful heirs"
"How sharper than a serpent's tooth it is / To have a thankless child!"
"grading papers is a thankless task"
经典引文
When friends come a long way..it seems pretty thankless to send them away without so much as a cup of tea.
出自：R. PilcherThe..Queen..had lain down her life for her thankless children.
出自：B. W. Aldiss近义词
临近词
