soundly

c. 1400s, from sound +‎ -ly. Originally meaning "safely", the present sense came in the 16^th century.

• (UK, US) IPA^(key): /ˈsaʊnd.lɪ/

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soundly (comparative more soundly, superlative most soundly)

1. In a thorough manner; in manner free of defect or deficiency.

   He was soundly thrashed by the semi-professional boxer.

   • 1610–1611 (date written), William Shakespeare, “The Tempest”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, OCLC 606515358, [Act IV, scene i], page 16:

     Pro. Let them be hunted ſoundly : At this houre / Lies at my mercy all mine enemies : […]

   • 1847 October 16, Currer Bell [pseudonym; Charlotte Brontë], chapter IV, in Jane Eyre. An Autobiography. […], volume I, London: Smith, Elder, and Co., […], OCLC 3163777, pages 42–43:

     Mrs. Reed soon rallied her spirits: she shook me most soundly, she boxed both my ears, and then left me without a word.

   • 1899, William George Aston, A History of Japanese Literature, page 272:

     The wedding company, fatigued with their enjoyment of the previous night, slept soundly late into the next morning.

   • 1911, L. D. Biagi, The Centaurians, Ch. I:

     My gold carried little weight with him, he was sincerely fond of me and consequently rated me soundly for all indiscretions, declaring I would regret wasting the best years of my life and deadening my vast talents […]

• completely, deeply, firmly, fully, perfectly, roundly, thoroughly, totally

• Douglas Harper (2001–2023), “soundly”, in Online Etymology Dictionary.