Source : WordNet®

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