And one of the evening's few unpredictable effects is wasted.

"When many drugs act together," he said, "they may often have unpredictable and dangerous effects."

At low level, the clashes were often confused and had unpredictable effects.

That means the drug you're getting may not work or may have unpredictable side effects.

As we suspected, the computer problems were caused by the unpredictable effects of the energy disturbance outside the ship.

Once begun, the procedure is irreversible and can often result in unpredictable side effects.

Scrolls have unpredictable effects that cannot be determined until they are used.

It is quite likely to cause unpredictable and possibly catastrophic side effects.

Others just fear the unpredictable effect of millions of new voters.

But spraying may have unpredictable adverse effects on our environment.