英语翻译：他是一个没有责任心的人

He is a man who has no the sense of responsibility.

He is a non-responsible man.

he is the person without responsibility!

He is a man lacking in responsibility.
He had no sense of responsibility.

He is not a person who take the responsibility uon himself

最简单的是.

He is not a responsible man.

麻烦点的.

He is a man lack of a sense of duty.