In a torturous fashion, or as if in torture(adverb)
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Use "torturously" in a sentence
"You are now experiencing something impossible, torturously impossible."
"Finally, after a torturously long time, a little old woman shuffled out of the meeting room and taped a small piece of paper to the wall, right under our event results."
"Just too damn torturously distressing on so many different levels."