1. In a painful manner.

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

• rainfull,
• pianfully,
• painfullly,
• paintfull,
• pitfully,
• paintfully,
• painfuls,
• painfull,
• painfuly,
• panfull,
• painlly,
• painfulf,
• painfulk,
• painfall,
• painfule,
• painlfully,
• palyfully,
• baenfully,
• geinfully,
• painfulyl

• painfulness,
• pain pill,
• panoply,
• painful.

The adjective form of "painfully" is "painful".