1. In a rueful manner.

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

• caefully,
• regully,
• refulls,
• graefully,
• regfully,
• refull,
• hoefully,
• truefully,
• truhfully,
• thefully,
• uefull,
• truefull,
• arefully,
• briefully,
• ruefull,
• ruwfully,
• reuefully,
• ruerfully,
• rufully,
• rueflly

• rueful,
• rubella,
• rubel,
• ruffle.

The adjective form of "ruefully" is "rueful".

The plural form of "ruefully" is "ruefully".

The singular form of the word "ruefully" is "rueful"