1. Necessarily.

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

• needfull,
• needfuls,
• meedfully,
• nwedfully,
• nsedfully,
• ndedfully,
• nredfully,
• n4edfully,
• n3edfully,
• neefully,
• needfuly,
• neadfully,
• needlly,
• unheedfully,
• unheedfulyl,
• needefuly,
• neadfuly,
• neadfull,
• neadfulle,
• needfulle

• needful.

The adjective form of the word "needfully" is "needed".

The plural form of the word "needfully" is "needfullys".

The singular form of the word "needfully" is "needfully".