へいこう
to be stumped; to be at a loss; to be at one's wits' end; to be nonplussed
He was stumped by the problem.
・closed
・shut
・mouth
to be fed up;to be tired (of);to be unable to bear;to be annoyed
へいこうとんしゅ
being at a complete loss as to what to do;being at one's wit's end;being at a loss for an answer