powerful vs weighty

powerful

adj
  • Large; capacious; said of veins of ore. 

  • Having, or capable of exerting power, potency or influence. 

  • Leading to many or important deductions. 

adv
  • Synonym of very 

weighty

adj
  • Heavy (“having a lot of weight”). 

  • Rigorous; severe; afflictive. 

  • Important; serious; not trivial or petty. 

How often have the words powerful and weighty occurred in a corpus of books? (source: Google Ngram Viewer )