laboured vs lumbering

laboured

adj
  • Expressive of strenuous effort. 

  • Of writing or speech or similar, stilted or not natural due to too much effort being used in the production. 

lumbering

adj
  • Heavy, slow and laborious; ponderous. 

  • Clumsy or awkward. 

noun
  • The business of felling trees for lumber. 

  • The act of one who lumbers; heavy, clumsy movement. 

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