Bound to revert to their primitive natures at some point, weren't they?

The relatively primitive nature of the bomb itself suggests an amateur job.

Towns and cities are foreign to their primitive nature so no way will they be coming back.

They demonstrate the primitive nature of humanity, but also the potential of the race to evolve and better itself.

It was simply the response of a primitive nature seeking its most natural environment.

"It is an indication of their more primitive nature."

But, for all its primitive nature, the housing would keep people alive during the winter.

Yet the technology he had was used to surprisingly good advantage, considering its rudimentary and truly primitive nature.

That will shake them to the roots of their primitive natures.

But it was tourism of an exceedingly primitive nature.