IPA: /ˈruːθfəli/
KK: /ˈruːθfəli/
In a way that shows sadness or regret, often with a sense of pity or compassion.
She smiled ruthfully as she remembered the mistakes of her past.
Ruthfully → It is formed from "ruth" (from Old English "rūð", meaning compassion or sorrow) and the suffix "-fully" (meaning in a manner full of). The word "ruthfully" means in a manner full of compassion or sorrow.
Think of 'ruth' as compassion or sorrow, and remember that 'ruthfully' means acting in a way that is full of compassion.