Another word for quietest

Even on the quietest days irregular changes are always numerous and often large.

The quietest and most distant of the brothers, Erik was charged with protecting northern Europe from demons.

This is the quietest and most expensive of the openers.

The retired naval man was speaking very boldly, as was evident from the expression on the faces of the listeners and from the fact that some people Pierre knew as the meekest and quietest of men walked away disapprovingly or expressed disagreement with him.

airflow velocity with the largest possible duct size is what will eventually produce the quietest results.