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Use "unfeignedly" in a sentence
"In the lower bunk lay Louis, grossly fat and warm and sweaty, asleep unfeignedly and sleeping laboriously."
"For this intervention we must be unfeignedly thankful."
"Diagnosing a problem in Devon from India has its limitations and though the operators have been unfeignedly polite and helpful it was the man up the pole a mile down the lane who eventually sorted things out."