1. With regard.

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

• eegardfully,
• degardfully,
• fegardfully,
• tegardfully,
• 5egardfully,
• 4egardfully,
• rwgardfully,
• rsgardfully,
• rdgardfully,
• rrgardfully,
• r4gardfully,
• r3gardfully,
• refardfully,
• revardfully,
• rebardfully,
• rehardfully,
• reyardfully,
• retardfully,
• regzrdfully,
• regsrdfully

• regardless,
• regardful,
• rewardingly,
• respectfully,
• remarkably,
• courageously,
• gratefully,
• considerably,
• regrettably,
• respectively.

The adjective form of the word "regardfully" is "regardful".