"ungrateful heirs"
"How sharper than a serpent's tooth it is / To have a thankless child!"
"grading papers is a thankless task"
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. Pilcher
The..Queen..had lain down her life for her thankless children.
出自: B. W. Aldiss
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海词词典,十七年品牌