Direct, abrupt, blunt or unequivocal; not prevaricating.
Of a collision, from the front or in the direction of motion.
A collision from the front.
With the front of a vehicle.
With direct confrontation.
Not rational; unfounded or nonsensical.
Of a real number, that cannot be written as the ratio of two integers.
A real number that can not be expressed as the quotient of two integers, an irrational number.