1. Singly; alone.

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

• solil,
• slley,
• sallly,
• slolwly,
• sllepy,
• soleley,
• scalely,
• solemely,
• selecy,
• losely,
• poliely,
• soliey,
• sortly,
• sovel,
• wholely,
• solumly,
• selelr,
• sowly,
• silenly,
• solowly

The adjective form of the word "solely" is "sole".