ungratefulness解释为： 徒劳
ungratefulness详细解释
n. 徒劳
例句与用法：
At the risk of sounding ungrateful, I must refuse your offer.
我甘受拂逆盛情之嫌，也必须谢绝你的提议。
"Besides, whether I am or not, " he added, "that has little or nothing to do with his thinking me ungrateful."
"况且，不管我是不是这样", 他接着说，"这和他认为我忘恩负义没有多大关系。"
Not thankful; ungrateful.
没有谢意的; 忘恩负义的
He is an ungrateful fellow; I'll never help him.
他是一个忘恩负义的家伙，我再也不帮他了。
词形变化：
副词: ungrate-fully |名词: ungratefulness |
详细释义：
n.
忘恩负义
