What does "regretfulness" mean?

The state or condition of being regretful.

What is a synonym for "regretfulness"?

Common synonyms include: apology, attrition, bitterness, contrition, grief, penitence.

noun

noun ·Rare ·Advanced level

Noun

1
The state or condition of being regretful. uncountable
"Mervyn thought that he could detect a certain regretfulness in his companion's voice."

"Mervyn thought that he could detect a certain regretfulness in his companion's voice."

From regretful + -ness.