deep mourning

noun

1. completely black mourning clothes made of a drab material:

   After her brother died, she was in deep mourning for a year.

Word History and Origins

Origin of deep mourning¹

First recorded in 1715–25

Example Sentences

One of his cousins was in deep mourning when she went into labor on Friday and gave birth to a baby boy.

From New York Times

Dr. Sarah Loguen Fraser may not have been a household name in the United States at the time of her death, but when word reached Puerto Plata, there was deep mourning.

From Scientific American

"On behalf of the RFL and the whole Rugby League family, I express our deepest and most sincere condolences on the passing of Her Majesty Queen Elizabeth II. The whole sport is in deep mourning at this extremely sad news," he added in a statement.

From BBC

Aptroot said the community was in deep mourning and he opened a condolence book at two local town halls and online.

From Seattle Times

And politicians, many from Mr. Abe’s Liberal Democratic Party, made their final appeals to voters before an election Sunday, in the shadow of deep mourning.

From New York Times