heaviness

(noun) the property of being comparatively great in weight. Synonyms: weightiness. Example: "The heaviness of lead."

(noun) persisting sadness. Example: "Nothing lifted the heaviness of her heart after her loss."

(noun) an oppressive quality that is laborious and solemn and lacks grace or fluency. Synonyms: ponderousness. Examples: "A book so serious that it sometimes subsided into ponderousness." "His lectures tend to heaviness and repetition."

(noun) used of a line or mark. Synonyms: thickness.

(noun) unwelcome burdensome difficulty. Synonyms: burdensomeness, onerousness, oppressiveness.