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preponderous

preˈponderous, a. rare.
  [f. pre- A. 5 + ponderous, after preponderate, etc.]
  Exceeding in weight, amount, or number; having the preponderance.

1700 S. Parker Six Philos. Ess. 53 When once gathered to a preponderous Body they [vapours] return, and become the material Cause of our extraordinary Showers of Rain. 1900 Yorks. Post 5 Jan. 7/1 We are in a position to-day of being sufficient throughout and preponderous nowhere.

Oxford English Dictionary

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