Placid is an adjective that means pleased, peaceful or quiet. It comes from the Latin placidus. There is also a lake called Lake Placid, northeast of New York.
The measure, which is on hold in the state Senate, generated some of the largest rallies ever seen at the normally placid Capitol earlier this year. (USA Today)
For much of the past two years, investors enjoyed a rising, and rather placid, stock market. (WSJ)