head-on vs uncivil

head-on

adj
  • Direct, abrupt, blunt or unequivocal; not prevaricating. 

  • Of a collision, from the front or in the direction of motion. 

adv
  • With the front of a vehicle. 

  • With direct confrontation. 

noun
  • A collision from the front. 

uncivil

adj
  • Not civil; discourteous; impolite 

  • Not civilized 

How often have the words head-on and uncivil occurred in a corpus of books? (source: Google Ngram Viewer )