sooth·fast /ˈsuθˌfæst/
  Sooth·fast a.  Firmly fixed in, or founded upon, the thruth; true; genuine; real; also, truthful; faithful. [Archaic] -- Sooth*fast*ness, n. [Archaic]  “In very soothfastness.”
     Why do not you . . . bear leal and soothfast evidence in her behalf, as ye may with a clear conscience!   --Sir W. Scott.
  Sooth·fast, adv. Soothly; really; in fact. [Archaic]
  I care not if the pomps you show
  Be what they soothfast appear.   --Emerson.
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