head-on vs robust

head-on

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

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

noun
  • A collision from the front. 

adv
  • With the front of a vehicle. 

  • With direct confrontation. 

robust

adj
  • Violent; rough; rude. 

  • Sensible (of intellect etc.); straightforward, not given to or confused by uncertainty or subtlety. 

  • Designed or evolved in such a way as to be resistant to total failure despite partial damage. 

  • Not greatly influenced by errors in assumptions about the distribution of sample errors. 

  • Resistant or impervious to failure regardless of user input or unexpected conditions. 

  • Requiring strength or vigor. 

  • Of an individual or skeletal element: strongly built; muscular; not gracile. 

  • Evincing strength and health; strong; (often, especially) both large and healthy. 

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