窮(きゅう)するto be at a loss, to be puzzled, to be perplexed, to be at one's wit's end, to be in a dilemma, to not know what to (do, say, etc)

する-verb (special), Intransitive verb

1. 1.

   to be at a loss, to be puzzled, to be perplexed, to be at one's wit's end, to be in a dilemma, to not know what to (do, say, etc)

2. 2.

   to be pressed for, to be pinched for, to become poor, to be reduced to poverty