Definition of "Heaviness" :

noun: unwelcome burdensome difficulty

noun: the property of being comparatively great in weight

"The heaviness of lead."

noun: used of a line or mark

noun: an oppressive quality that is laborious and solemn and lacks grace or fluency

"His lectures tend to heaviness and repetition."

noun: persisting sadness

"Nothing lifted the heaviness of her heart after her loss."