If I were you, I wouldn't mention the plague in casual discussion.

"The situation is much too complex to explain in a casual discussion."

As it is, casual discussion of a patient's illness may lead to discriminatory treatment.

Dax repressed a shiver at this casual discussion of their catastrophic future.

"Chief Gates and I had a very long and very casual discussion before coming here this morning," he said.

What he thought he had seen out there was too ridiculous for casual, social discussion.

When that timetable arose this fall, the two had casual discussions about her next move but plans were not completed.

Not all jurors had read the same material, so even casual discussions in the jury room were difficult.

He decided to contact the younger man, for a casual discussion of the bulletin, nothing more.

I've seen some casual discussions of it on the science nets.