Running at the mouth
quickly or rapidly.
Quickly, fast.
Precipitate.
The word 'rapidly' is an adverb, a word that modifies a verb, an adjective, or another adverb. Example:The boy rapidly ran to catch the ball before it could hit the ground.
rapidly, speedily
The word that means talking madly is "ramble." It refers to speaking rapidly and incoherently.
Another word for talking quietly is whispering.
Discussing.
Another word for talking fast is yapping, I really dont even know if It`s a word but it's just what came into my head :L x
Another word for signs is probably going to be symbols but it depends on what you're talking about
mutter
yakking