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Deceitfulness is the quality of being deceitful — the habit or character of lying, or hiding the truth, to get what you want. It is uncountable: we do not say a deceitfulness. You meet it in serious writing about a person's nature, not much in daily chat. In speech, people are far more likely to say He's so deceitful than to name his deceitfulness. One lie is a lie, or deceit; deceitfulness is the streak in the person that keeps producing those lies.
狡詐、愛騙人（指個性，不是單一次謊言）
原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
deceitfulnessnoun/dɪˈsiːtfəlnəs/
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The state or quality of being deceitful; duplicity.
- O full off all sutelte and disseytfulnes the chylde off the devyll, and the enemye of all righteousnes thou ceasest not to pervert the strayght wayes off the lorde.
- 'This is the hend, is it, of all my bearing with her deceitfulness, her lowness, her falseness, her laying herself out to catch the admiration of vulgar minds . . .'
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。