"heaviness" in the noun sense
1. heaviness, weightiness
the property of being comparatively great in weight
"the heaviness of lead"
2. heaviness
persisting sadness
"nothing lifted the heaviness of her heart after her loss"
3. ponderousness, heaviness
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"
4. thickness, heaviness
used of a line or mark
5. burdensomeness, heaviness, onerousness, oppressiveness
unwelcome burdensome difficulty
Source: WordNet® (An amazing lexical database of English)
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