不想用心的英文怎么说

在英语中，"不想用心"的意思可以用 "lack of enthusiasm" 或 "lack of effort" 来表达。

"Lack of enthusiasm" 意为 "缺乏热情"，"lack of effort" 意为 "缺乏努力"。这两个词都表示一种对于某事不太感兴趣或不太努力的态度。

下面是一些例句：

His lack of enthusiasm for the project was obvious to everyone. 他对这个项目没有什么热情是显而易见的。

She criticized him for his lack of effort in studying for the exam. 她批评他考试前没有足够努力学习。

The team's lack of enthusiasm was a major factor in their defeat. 这支队伍缺乏热情是他们失败的主要原因。

He was fired from his job due to his lack of effort. 他因为缺乏努力而被解雇了。