Soothfast

Part of speech: adjective (a.)

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.

Part of speech: adverb (adv.)

Soothly; really; in fact. [Archaic] I care not if the pomps you show Be what they soothfast appear. Emerson.