pain-free vs straightforward

pain-free

adj
  • without pain, free of pain. 

straightforward

adj
  • easy, simple, uncomplicated, without difficulty 

  • proceeding in a straight course or manner; not deviating 

  • direct; forthright; frank; sincere 

adv
  • In a straightforward manner; straightforwards; straightforwardly. 

How often have the words pain-free and straightforward occurred in a corpus of books? (source: Google Ngram Viewer )