English

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Etymology

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From Middle English sothly, soþliche, from Old English sōþlīċe; equivalent to sooth +‎ -ly.

Adverb

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soothly (comparative more soothly, superlative most soothly)

  1. (archaic) Truly, verily.
    Synonyms: in fact, soothfast; see also Thesaurus:actually