heaviness
noun [ U ] uk/ˈhev.i.nəs/ us/ˈhev.i.nəs/
(WEIGHING A LOT)
重，沉重
the quality of weighing a lot
(TO A GREAT DEGREE)
严重性
the quality of being done or happening to a great degree
We were delayed by the heaviness of the traffic. 我们被拥堵的交通耽误了。