Throatily describes a sound made in a way that is low, rough, and seems to come from deep in the throat rather than clearly from the mouth. You use it with verbs of sound-making: laugh throatily, sing throatily, chuckle throatily, say something throatily. The picture is a voice with a grain in it — deep, a little husky, a little rough at the edges. The feeling attached is usually attractive rather than unpleasant, which surprises students. A throaty laugh in a novel is warm and knowing; a throatily sung note is rich; a throatily whispered line is meant to sound sexy. That is quite different from the roughness of illness, which English handles with 'hoarsely' or 'croakily'. If someone is sick, they speak hoarsely; if someone is being deep and attractive, they speak throatily. The word also gets used of engines — a car engine that growls low can be described as throaty, though the adverb form is rarer there. Though actually, you will almost only meet this word in writing, and mostly in fiction. It belongs to the family of adverbs novelists use to describe how a character speaks. In conversation, people simply say 'she laughed, kind of deep and rough'.