sturdy vs unsafe

sturdy

adj
  • Resolute, in a good sense; or firm, unyielding quality. 

  • Of firm build; stiff; stout; strong. 

  • Solid in structure or person. 

noun
  • A disease caused by a coenurus infestation in the brain of an animal, especially a sheep or canid; coenurosis. 

unsafe

adj
  • Not safe (various senses); dangerous. 

verb
  • To remove the safety from (a weapon). 

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