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Webster 1913 Edition

Adj.

Having faith or a faith; honest; sincere.

[Obs.]

“Make thy words faithed.”

Shak.

Adj.

Honest; sincere. [Not used.]

faithed ‎(comparative more faithed, superlative most faithed)

(obsolete) Having faith or a faith; honest; sincere.
Make thy words faithed. — Shakespeare.