head-on vs incisive

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. 

incisive

adj
  • Quickly proceeding to judgment and forceful in expression. 

  • Accurate and sharply focused. 

  • Intelligently analytical and concise. 

  • Having the quality of incising, cutting, or penetrating, as with a sharp instrument. 

  • Of or relating to the incisors. 

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