rueful
Rueful is an adjective meaning full of or expressing sorrow, regret, or pity. It can convey mild sadness, disappointment, or a sense of irony. A rueful remark or expression often signals self-awareness about a fault or misfortune, sometimes with a touch of humor rather than outright gloom. The term is commonly used to describe facial expressions, tones, or assessments that acknowledge something unfortunate without melodrama.
In usage, rueful commonly modifies nouns such as smile, grin, expression, or memory. For example, one might
Adverbially, ruefully, the word is used to describe actions done with regret or ironic humor. For instance,
Etymology traces rueful to the verb rue, meaning to feel regret, with usage entrenched in English from
See also: regret, remorse, sorrow, melancholy. Rueful contrasts with stronger terms such as mournful or despondent