rozwartokątny in inglese:

Is he trying to prove that he's as obtuse as it seems?

Triangle can have only one obtuse angle.

He is too obtuse to take a hint.

Political opponents warned that the prime minister’s obtuse approach to foreign policy would embroil the nation in mindless war.

he wondered if the doctor was being deliberately obtuse

When you think about it, it's all Kenny's fault for being so obtuse.

Pedants delight in being obtuse.