Overuse at best is needless clutter; at worst, it creates the impression that the characters are overacting, emoting like silent film stars. Still, an adverb can be exactly what a sentence needs. They can add important intonation to dialogue, or subtly convey information.
Howard Mittelmark, How Not to Write a Novel: 200 Classic Mistakes and How to Avoid Them—A Misstep-by-Misstep Guide
adverbs, dialogue, writing