not know the meaning of the word idiom
（某人对做某事）没有经验，一无所知;（某人）完全缺乏某种素质
If you are talking about a quality or an activity and you say that someone doesn't know the meaning of the word, you mean they do not have that quality or have no experience of that activity.
Work? He doesn't know the meaning of the word! 工作？他对工作根本一无所知。
And the irony of Phil talking about ethics. He doesn't know the meaning of the word. 菲尔谈论道德规范简直是个讽刺。他本身根本就是一个没有道德的人。