nonhostile vs unfriendly

nonhostile

adj

  • Not hostile; free of hostility 

unfriendly

adv

  • in an unkind or unfriendly manner; not as a friend 

noun

  • An enemy. 

adj

  • Not friendly; hostile; mean. 

  • Unfavourable. 

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