Audibly and Visibly

These are two words that don't add much to your prose. Think about it, what do they really add. When you say: Chester sighed audibly. It means the exact same thing as: Chester sighed. It is not like you would ever say: Chester sighed inaudibly. The same goes for visibly. If the character never performs the action invisibly, then there is no point in having them perform the action visibly. The reader will assume it is visible unless told otherwise.