1. In a tuneful manner.

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

• truefully,
• tatefully,
• turefuly,
• tasefully,
• tunefull,
• runefully,
• funefully,
• gunefully,
• yunefully,
• 6unefully,
• 5unefully,
• tynefully,
• thnefully,
• tjnefully,
• tinefully,
• t8nefully,
• t7nefully,
• tubefully,
• tunefuly,
• gulefully

• tunefulness,
• tuneful.

The adjective form of the word "tunefully" is "tuneful".