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
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.
They went to bed quite early and slept soundly until daylight, when they were awakened by the crowing of a green cock that lived in the back yard of the Palace, and the cackling of a hen that had laid a green egg.
So they lay down among the sweet smelling yellow flowers and slept soundly until morning—all but the Scarecrow and the Tin Woodman.
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