'placid day' is correct and usable in written English
You can use it to refer to a calm and peaceful day. Example sentence: Today was a placid day, with the sun shining and the birds chirping.
A placid day in the Tour de France, with the usual small falls, attacks and a three-man breakaway that was caught near the finish, exploded into chaos in the last few miles today when two crashes splintered the pack and slowed several major riders, including Lance Armstrong.
Memorial Day is normally a placid day in sports that allows us to remember what we're supposed to be remembering, and no, not just how long to grill the burgers.
I mean you live up to your name when your name is placid Sunday.
The raid, which was televised live on a placid Saturday, seized her attention because it occurred at her parents' workplace: the Lindstrom Family Auto Wash.
SUNDVOLLEN, Norway — On a sunny, placid Friday one week ago Marcel Gleffe was relaxing at Utvika, a pristine campsite on Lake Tyrifjorden not far from here, when he recognized the sound coming from Utoya, an island less than a half-mile away.
And this was just what Fernando Ferrer, the Bronx borough president and Democratic candidate for mayor, wanted: a predictably placid Sunday morning that offered a dandy moment to make a bit of news.
A placid dawn on Sunday morning revealed half a foot of water in the dock shop and a giant lake around Mr. Davis's house.
Remember the Church of England, that mythically placid community of Sunday Christians and beaming vicars whom you met in Austen and possibly came to loathe in Trollope?
The bright sun and placid breeze on Sunday served as a strange counterpoint to the emerging anguish in Fernley, where virtually nobody has flood insurance.
Jumbo appeared so because he had been cruelly tamed (or "broken") – and even then was placid only during the day.
Although placid and content all day, once midnight rang out, a high-pitched crying began that abated only briefly at unpredictable moments and would not cease completely until well after dawn had broken.
