uncompatible vs unfriendly

uncompatible

adj

  • Incompatible. 

unfriendly

adj

  • Unfavourable. 

  • Not friendly; hostile; mean. 

noun

  • An enemy. 

adv

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

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