Rueful can express regret with a touch of irony or wry amusement, showing one can also see humor in their own faults. His rueful chuckle after recounting the story made us all smile.
Pro Tip 2/3
Subtle Regret
It's used for mild regrets, not deep sorrow or guilt; appropriate for trivial mistakes or minor offenses. She was rueful for forgetting to bring snacks to the party.
Pro Tip 3/3
Facial Expressions
Often associated with specific expressions, like a rueful smile, indicating an acknowledgment of a misstep. He gave a rueful grin when asked about the missing cookies.