frontal
Related to the front side; coming from the front or concerning the front side.
Bei dem Unfall kam es zu einem frontalen Zusammenstoß zweier Fahrzeuge.
The accident involved a frontal collision between two vehicles.

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Related to the front side; coming from the front or concerning the front side.
Bei dem Unfall kam es zu einem frontalen Zusammenstoß zweier Fahrzeuge.
The accident involved a frontal collision between two vehicles.

The adjective 'frontal' is derived from the noun 'die Front' (the front). So it always describes something that has to do with the front side or with a direct confrontation.
Die Soldaten bereiteten sich auf einen Angriff an der Front vor.
The soldiers prepared for an attack at the front.
The noun that 'frontal' describes reveals the exact meaning. A 'frontaler Zusammenstoß' (frontal collision) is literally from the front, a 'frontaler Angriff' (direct attack) in a discussion is direct and confrontational, and 'frontaler Unterricht' (teacher-centered instruction) describes a particular teaching method.
Das Auto hat einen frontalen Schaden.
The car has frontal damage.
In the literal meaning, 'frontal' is often used in connection with accidents and views. Typical combinations are 'frontaler Zusammenstoß' (frontal collision), 'frontale Kollision' (frontal collision), or 'eine frontale Ansicht' (a frontal view).
Das Museum bietet eine frontale Ansicht der Skulptur.
The museum offers a frontal view of the sculpture.
In the figurative sense, 'frontal' describes a direct confrontation. Common phrases are 'ein frontaler Angriff' (a direct attack), 'frontale Kritik üben' (to offer direct criticism), or 'eine frontale Auseinandersetzung' (a direct confrontation).
Die Politikerin wählte in der Talkshow den frontalen Angriff.
The politician chose a direct attack on the talk show.
direct
'direkt' and 'frontal' can both describe someone acting or speaking openly and without evasion. 'direkt' is more neutral: you say clearly what you think. 'frontal' sounds stronger and often more combative. It fits when someone attacks or confronts a person or opinion very openly. Learners may confuse the words because both can mean without going indirectly. But 'frontal' usually has more pressure and conflict, while 'direkt' can also simply be honest and clear.

Samir kritisiert den Vorschlag frontal, weil er ihn unfair findet.
Samir attacks the proposal head-on because he finds it unfair.
Nach dem Gespräch sprechen wir direkt über das Problem zu Hause.
After the conversation, we speak directly about the problem at home.