flatly

This adverb carries two distinct emotional registers. When used to describe a refusal or a statement, it conveys a sense of uncompromising firmness and finality. It suggests a boundary that cannot be crossed, often appearing in contexts of conflict or strict authority to indicate that further negotiation is useless.

In contrast, when describing a manner of speaking, it denotes a complete absence of inflection or emotional resonance. This creates a cold, robotic, or detached atmosphere, often used in literature to signal a character's shock, boredom, or clinical indifference.