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The Collaborative International Dictionary
Soothfastness

Soothfast \Sooth"fast`\, a. [Sooth + fast, that is, fast or firm with respect to truth.] 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.

Wiktionary
soothfastness

n. truth; honesty; veracity