peaceful day; quiet day
Literary or formal word for a day without trouble or disturbance. Often used in negative constructions such as 寧日がない (there is no peaceful day).
In times of war, the people had no peaceful days.
His workplace is so busy that there is never a quiet day.
Compound of 寧 (peaceful, quiet) and 日 (day). The exact historical derivation is uncertain, but the word follows a classical Chinese pattern for forming nouns.