invisible

Without this invisible barrier, Earth would be exposed to the same constant stream of charged particles that bombards other planets in our solar system, such as Mars, making life there far more difficult.

Dairymaids were said to have a kind of second sight, transforming milk into something alive and lasting with nothing more than time, touch, and faith in invisible powers.

That suggests that when AI assistance is invisible—which it often is—observers are likely to fill in the gaps based on what they already believe about the employee.

Nothing, not even light, can escape a black hole, making it completely invisible to telescopes.

Sometimes this meet and greet releases massive energy in the form of powerful invisible jets, appearing just like the water jet used by firefighters to put out a fire.