1. Trustworthy.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• daithworthy,
• caithworthy,
• vaithworthy,
• gaithworthy,
• taithworthy,
• raithworthy,
• fzithworthy,
• fsithworthy,
• fwithworthy,
• fqithworthy,
• fauthworthy,
• fajthworthy,
• fakthworthy,
• faothworthy,
• fa9thworthy,
• fa8thworthy,
• fairhworthy,
• faifhworthy,
• faighworthy,
• faiyhworthy

• steadfast,
• responsible,
• conscientious,
• sincere,
• genuine,
• faithful,
• loyal,
• devoted,
• faith,
• honorable,
• trustworthy,
• dependable,
• ethical,
• reliable,
• committed.

The adjective form of the word "Faithworthy" is "Faithworthy".