ungratefulness

1. Other unfavorable characteristics include: bad communication skills, rudeness, ungratefulness and self-centeredness.
   其它不太让人喜欢的特点还有：沟通能力差、不懂礼貌和感恩、以自我为中心等。
2. When we are successful, we can surely have many reasons for being grateful, but we have only one excuse to show ungratefulness if we fail.
   如果一味怨恨，终将一无所获。我们成功时，有千万个理由感恩生活，而失败时，只要一个借口就会表现出忘恩负义。

noun

1. a lack of gratitude

   Synonym:    ingratitude