[Nadya]

I'd define it as not personally fun or entertaining.

I don't go to the movies. I'd rather read a book. I don't go to parties. I'd rather work on my calligraphy. I don't drink - not even lightly - but I see heavy drinking as a complete waste of time (literally blacking out or not having memory of most of the previous night).

If I ever have the feeling of "I'd rather be doing something else" then chances are what I'm doing is a waste of my time. I should be doing that something else.