Intermediate (B1)
IPA: /ˈruːfəli/
KK: /ˈruːfəli/
Definition
In a way that shows sadness or regret about something that has happened.
Example
She smiled ruefully as she remembered her past mistakes.
Conversation

I missed the concert last night, and I feel so bad about it.

Aw, that's too bad! Did you forget the date?

Yeah, I did. I just sat there ruefully scrolling through social media.

I can imagine — it's tough seeing everyone else having fun.
Synonyms & Antonyms
Synonyms
sorrowfully
regretfully
mournfully
Antonyms
cheerfully
joyfully
happily
Root Explanation
Ruefully → It is formed from "rue" (from Old French *rue*, meaning to feel regret or sorrow) and "-fully" (meaning in a manner full of). The word "ruefully" means in a manner full of regret or sorrow.
Memory Tip
Think of feeling regret ('rue') and doing so in a way that is full ('-fully') — that's why ruefully means expressing regret.
Visually Confused Words
usefully
irefully
rebukefully
grudgefully
tunefully
ruthfully
restfully
ragefully