Adjective

1. Direct, abrupt, blunt or unequivocal; not prevaricating.

   a head-on approach to a problem

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

   Getting into a head-on collision is dangerous.

Noun

1. A collision from the front.

   He was injured in a head-on with a larger vehicle.

Usage notes

• The adjective is also head on, especially when appearing after the verb, as in

  She likes to tackle problems head on.