Both the strength and frequency of the signal would vary unpredictably.

There was no telling how long he would have to wait: trans-space transmission time varied unpredictably.

The brightness varies slowly and unpredictably over a 1-2 magnitude visual range and can remain approximately constant for many years.

In other countries usage may vary unpredictably.

However, since vellum was used for the heads of the drums, automated solutions were difficult to implement since the tension would vary unpredictably across the drum.

The result is that the actual levels of oxygen and carbon dioxide vary unpredictably from sample to sample, but the total of the two gases remains constant.

The company showed very little interest in the magazine itself; throughout the 1990s, the number of issues per year varied unpredictably.

A packet's delay varies with its position in the queues of the routers along the path between source and destination and this position can vary unpredictably.

Its distance from Earth is about 460 light years, and its apparent magnitude varies unpredictably from about 9.3 to 14.

While his suggestions on comportment and stance are consistent, the singing advice that Quasthoff gives to individual performers varies unpredictably.