1. (noun) heaviness, weightiness
the property of being comparatively great in weight
Synonyms: weightiness, heaviness, burdensomeness, ponderousness, onerousness, weight, thickness, oppressiveness
Antonyms: lightness, weightlessness
2. (noun) heaviness
persisting sadness
Synonyms: onerousness, burdensomeness, weightiness, ponderousness, thickness, oppressiveness
Antonyms: weightlessness, lightness
3. (noun) ponderousness, heaviness
an oppressive quality that is laborious and solemn and lacks grace or fluency
Synonyms: heft, massiveness, weightiness, heftiness, burdensomeness, oppressiveness, onerousness, heaviness, ponderosity, thickness, ponderousness
Antonyms: lightness, weightlessness
4. (noun) thickness, heaviness
used of a line or mark
Synonyms: onerousness, heaviness, burdensomeness, weightiness, ponderousness, thickness, oppressiveness
Antonyms: weightlessness, lightness
5. (noun) burdensomeness, heaviness, onerousness, oppressiveness
unwelcome burdensome difficulty
Synonyms: weightiness, heaviness, burdensomeness, ponderousness, onerousness, oppression, thickness, oppressiveness
Antonyms: lightness, weightlessness
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Synonyms and Antonyms of heaviness 
