head-on vs sure

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. 

sure

adj
  • Certain to act or be a specified way. 

  • Physically secure and certain, non-failing, reliable. 

  • Certain in one's knowledge or belief. 

intj
  • Yes, expressing noncommittal agreement or consent. 

  • Yes; of course. 

  • You're welcome; polite response to being thanked. 

adv
  • Without doubt, certainly. 

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