unbalanced vs unsafe

unbalanced

adj
  • irrational or mentally deranged 

  • of an expression having different numbers of left and right parentheses 

  • not adjusted such that debit and credit correspond 

  • not balanced, without equilibrium; dizzy 

  • an offensive line with more players on one side of the center than on the other 

unsafe

adj
  • Not safe (various senses); dangerous. 

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

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