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Noun: ponderousness  pón-du-rus-nus
  1. An oppressive quality that is laborious and solemn and lacks grace or fluency
    "a book so serious that it sometimes subsided into ponderousness";
    - heaviness
  2. The property of being large in mass
    - heft, heftiness, massiveness, ponderosity

Type of: heaviness, uninterestingness, weightiness