1. With little depth; superficially.

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

• shadowly,
• fallowly,
• ahallowly,
• zhallowly,
• xhallowly,
• dhallowly,
• ehallowly,
• whallowly,
• sgallowly,
• sballowly,
• snallowly,
• sjallowly,
• suallowly,
• syallowly,
• shalloely,
• shalowly,
• Shaufowl,
• shellowrk,
• shallowley,
• shaloewly

The adjective form of the word "shallowly" is "shallow".