1. Immediately; directly.

2. Immediately; without delay.

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

• monthwith,
• northwich,
• dorthwith,
• corthwith,
• vorthwith,
• gorthwith,
• torthwith,
• rorthwith,
• firthwith,
• fkrthwith,
• flrthwith,
• fprthwith,
• f0rthwith,
• fortwith,
• forthwth,
• forthwih,
• forthwithh,
• Forahlite,
• forethooth,
• fourtthwith

• forty-three,
• forth,
• fortuity,
• forty-third,
• fortieth,
• fortuitous,
• worthier.

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