unthankful基本解释
adj.不感谢的;不感恩的;不知感谢的
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副词: unthankfully 名词: unthankfulness
adj.不感谢的;不感恩的;不知感谢的
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副词: unthankfully 名词: unthankfulness
"ungrateful heirs"
"How sharper than a serpent's tooth it is / To have a thankless child!"