Read the excerpt from A Wrinkle in Time. And perhaps this was not very surprising, for the main thing about the surroundings was exactly that they were unnoticeable. They seemed to be standing on some kind of nondescript, flat surface. The air around them was gray. It was not exactly fog, but she could see nothing through it. Visibility was limited to the nicely definite bodies of Charles Wallace and Calvin, the rather unbelievable bodies of Mrs. Whatsit and Mrs. Who, and a faint occasional glimmer that was Mrs. Which.

What is the meaning of nondescript?

dull and uninteresting

difficult to see

bright and shiny

hard to understand