Brooding sarcasm is a literary technique used to describe a character's bitter and ironic tone, often combined with a sense of gloom or introspection. Synonyms for brooding sarcasm include acerbic, caustic, cutting, sardonic, and biting wit. These terms convey a sense of sharp-tongued humor that is laced with dark undertones. Another synonym for brooding sarcasm is mordant, which suggests a biting or corrosive quality. In addition, scathing and snarky are also be used to describe this style of sarcasm. These words all imply a level of disdain or bitterness that is expressed through ironic or mocking commentary.