Water drawn directly from a stream, lake, or aquifer and that has no treatment will be of uncertain quality.

An uncertain quality came into his voice.

Like the Parson, he had a dangerous, uncertain quality.

About.com called the song "an everyday scene from an independent film of uncertain quality", giving it a rate of 3 out of 5 stars.

This time the laughter round the table had a nervous, uncertain quality to it.

They say, among other things, that desalted water is of uncertain quality and has high energy costs.

Hospitals have uncertain quality at higher and higher costs.

But the landscape had an uncertain quality, as if it hadn't quite made up its mind to be there or not.

As far as they were concerned, what was he but a frontier dihqan of uncertain but dubious quality?

They provide safe water when shore-based water is of uncertain quality.