#1 heaviness n. [weightiness] the property of being comparatively great in weight; "the heaviness of lead". wn
#2 heaviness n. persisting sadness; "nothing lifted the heaviness of her heart after her loss". wn
#3 heaviness n. [ponderousness] an oppressive quality that is laborious and solemn and lacks grace or fluency; "a book so serious that it sometimes subsided into ponderousness"; "his lectures tend to heaviness and repetition". wn
#4 heaviness n. [thickness] used of a line or mark. wn
#5 heaviness n. [burdensomeness, onerousness, oppressiveness] unwelcome burdensome difficulty. wn
vizzz