まる(きわまる) (VI) Extremely bad: bloody, utterly (fucked), downright (sadistic), deadly (dull), outright (scandalous). It’s a verb, but it’s used as an adjective.: BAD ADJECTIVE + 極める(intensifier)+ SUBJECT (NOUN).   $$$
まる(きわまる) (VI) To be caught in a dilemma, to have your back to the wall, to the point where there seems to be no hope. Almost never used、except in the phrase 感がきわまる: To be about to flip out from the stress.