Soothfast /(?)/
Sooth·fast
Soothfast
a.
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Firmly fixed in, or founded upon, the thruth; true; genuine; real; also, truthful; faithful. [Archaic]
Why do not you . . . bear leal and soothfast evidence in her behalf, as ye may with a clear conscience!
Soothfast
adv.
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Soothly; really; in fact. [Archaic]
I care not if the pomps you show Be what they soothfast appear.