Even his tongue, Himmel noted once again with disgust, had a peculiar tinge, as if corrupted by some unnatural substance.

A powerful odor, sulphurous in nature, with a stinging bite of even more sinister and unnatural substances, rose from the pit and filled the air around them.

I am totally against unnatural substances.

The matter of Gahadion, and all Markavvel, altered into unnatural substances.

It's not enough that you should subject us to strange and unnatural alien substances, now you must needs bring your family in on us.

It was hard to realize that just a week ago I was lying by a pool down in Mexico, swabbing myself with unnatural substances.

The chemicals usually induced vomiting as the intestines rejected the unnatural substance.

Introducing unnatural substances such as drugs into the body to improve health has proved a poor idea.

The problem is that they want to work in a specific environment and don't want to work with any unnatural substances.

An autopsy confirmed that no drugs or unnatural substances were present in Nash's body at the time of death.