soothfast

soothfast is an   Adverb

Definition:

[1] Firmly fixed in, or founded upon, the thruth; true; genuine; real; also, truthful; faithful. [Archaic] -- Sooth"fast`ness, n. [Archaic] "In very soothfastness." Chaucer. Why do not you . . . bear leal and soothfast evidence in her behalf, as ye may with a clear conscience! Sir W. Scott.

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