IPA: /ˈruːfəl/
KK: /ˈruːfəl/
Feeling or showing sadness or regret about something that has happened.
He gave a rueful smile when he remembered his mistake.
Comparative: more rueful
Superlative: most rueful
Rueful → It is formed from "rue" (from Old French *rue*, meaning to feel regret or sorrow) and "-ful" (meaning full of). The word "rueful" means full of regret or sorrowful.
Think of feeling regret ('rue') and being 'full of' that feeling ('-ful'). This helps you remember that 'rueful' describes someone who is full of regret.