front‧al [only before noun] formal
at or relating to the front part of something:
the frontal armour of the new tanks
a direct attack on the front of an army:
The minefields make an all-out frontal attack impossible.
an attack or criticism that is very strong and direct:
After the election, the party launched into a frontal assault on the British media.
relating to the front part of the head:
the frontal lobes of the brain