protected vs unguarded

protected

adj
  • Having the protected access modifier, indicating that a program element is accessible to subclasses but not to the program in general. 

  • defended 

unguarded

adj
  • Having no guard or protection; vulnerable. 

  • Displaying a lack of caution or thought. 

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