What is kare wa orokana monodesu in English?

It means this is stupid Mono. Depending if you're referring to a person when you say mono desu. Mono in Japanese doesn't mean anything if you aren't referring to the person Mono. So my answer is This is stupid. When you say this, you are referring to an item, like for example; You're friend shows you a key chain that looks stupid, you say, "Kare wa orokana monodesu." meaning, "This is stupid."