caustic

The term evokes a sensation of chemical erosion, where a substance doesn't just touch a surface but actively eats away at it. In a literal sense, it describes a harsh, destructive power that dissolves material, creating a feeling of danger or permanent damage. When applied to speech or personality, it describes a specific type of wit that is intended to wound rather than to joke. While sarcasm can be playful, caustic language is designed to strip away the target's dignity or confidence, acting like an acid on a person's ego.