1. [adv]  with the front foremost; "the cars collided head-on"
2. [adv]  in direct opposition; directly; "we must meet the problem head-on"
3. [adj]  meeting front to front; "a frontal attack"; "a head-on collision"
4. [adj]  characterized by direct opposition; "a head-on confrontation"

HEAD-ON is a 7 letter word that starts with H.