soundly
/ˈsaʊnd.lɪ/ adverb C1- In a thorough manner; in manner free of defect or deficiency. · He was soundly thrashed by the semi-professional boxer.
From the library
Minnie May was much better and was sleeping soundly.
Anne accordingly went to bed and slept so long and soundly that it was well on in the white and rosy winter afternoon when she awoke and descended to the kitchen where Marilla, who had arrived home in the meantime, was sitting knitting.
The sheets were made of blue cloth, and Dorothy slept soundly in them till morning, with Toto curled up on the blue rug beside her.
These kept her very snug and warm, and she slept soundly until morning.
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