1. By that means: in consequence of that.

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

• thereoy,
• thirety,
• theray,
• thursby,
• thereapy,
• therby,
• thery,
• therory,
• therei,
• therepay,
• therioy,
• theree,
• thearey,
• theraoy,
• theorey,
• theirby,
• theroty,
• thereany,
• therea,
• therey

• Thrope,
• thrip,
• thorpe,
• tharpe,
• thereof,
• therapy,
• thurify,
• throb,
• tharp,
• thrive,
• Thorp.

The adjective form of "thereby" is "thereby" itself. It is not commonly used as an adjective, but rather as an adverb that indicates a consequence or result.