An unknown quality is missing from dead tissue, the important quality-life.

Then his expression changed and he looked at her as if she were suddenly a stranger, an unknown quality.

But there was something about her, some purely unknown quality.

Secondly, you're human, which makes you an unknown quality in this broth of politics.

Many townspeople are also forced to rely on well water of unknown quality.

Penny went out to pet him, but I warned her away, as he was a big dog and an unknown quality.

At such temperatures, matter begins to exhibit previously unknown qualities.

But there was something more, and that unknown quality had the potential to be his worst nightmare.

After seven years in the army, three and a half of them abroad, home was an unknown quality... War had changed the whole bloody world.

The Masters had qualities and abilities now unknown to any of us.