Etymology
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heaviness (n.)

Old English hefigness "state of being heavy, weight; burden, affliction; dullness, torpor;" see heavy (adj.) + -ness. Chaucer has heavity for "sadness."

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Definitions of heaviness

heaviness (n.)
the property of being comparatively great in weight;
the heaviness of lead
Synonyms: weightiness
heaviness (n.)
persisting sadness;
nothing lifted the heaviness of her heart after her loss
heaviness (n.)
an oppressive quality that is laborious and solemn and lacks grace or fluency;
his lectures tend to heaviness and repetition
Synonyms: ponderousness
heaviness (n.)
used of a line or mark;
Synonyms: thickness
heaviness (n.)
unwelcome burdensome difficulty;
Synonyms: burdensomeness / onerousness / oppressiveness
From wordnet.princeton.edu