head–on 
/ˈhɛdˈɑ:n/ adverb
/ˈhɛdˈɑ:n/ adverb 1 : with the head or front hitting first
▪ The two cars collided head-on. 2 : in a very direct way
▪ She decided to confront/meet the challenge head-on.
▪ The two cars collided head-on.
▪ She decided to confront/meet the challenge head-on.
— head–on adjective always used before a noun
▪ a head-on collision/confrontation
▪ a head-on collision/confrontation
