cessation — The cessation of something is the stopping of it.
decline — If something declines, it becomes less in quantity, importance, or strength.
decrease — When something decreases or when you decrease it, it becomes less in quantity, size, or intensity.
idleness — the quality, state, or condition of being lazy, inactive, or idle: His lack of interest in the larger world and his consummate idleness were the causes of their dreadful divorce.