Heavy-handedness is the noun: the quality of being heavy-handed. It is what you name when a person, a government, or a piece of writing uses too much force, too much control, or too little care for other people's feelings. People complained about the heavy-handedness of the ban. The heavy-handedness of the film made the lesson feel like a scolding. Use heavy-handed when you need an adjective, and heavy-handedness when you need the name of the thing itself. It is a critic's word, a little formal, and it always leans negative.