Meaning of the word rueful in English

What does rueful mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

rueful

US /ˈruː.fəl/
UK /ˈruː.fəl/

Adjective

expressing sorrow or regret, often in a slightly humorous or ironic way

Example:
He gave a rueful smile as he admitted his mistake.
Her rueful expression showed she knew she was in trouble.