He lights the fuse with an extremely primitive version of a cigarette lighter and tells him: "You may fire when ready."

This is the more surprising in view of their extremely primitive, energy-intensive beam weapons.

It is sometimes used as an extremely primitive form of cipher.

Some computers can determine what the picture is, but only on an extremely primitive level.

And their data were amassed by extremely primitive means.

They are an extremely primitive species, though some 12,000 years into their Sentient Age.

Note that a thermostat, which can sense its environment and make changes to it, is often used as an example of an extremely primitive robot.

She had been living in extremely primitive conditions in Sanctuary long before the rest of them arrived.

The "animals" of Planet Two were, he'd been told, extremely primitive.

Of course, their technology was extremely primitive, not even extending to faster-than-light travel.