1. By way of protesting.

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

• orotestingly,
• lrotestingly,
• -rotestingly,
• 0rotestingly,
• peotestingly,
• pdotestingly,
• pfotestingly,
• ptotestingly,
• p5otestingly,
• p4otestingly,
• pritestingly,
• prktestingly,
• prltestingly,
• protestongly,
• protestintly,
• protestinly,
• protesitngly,
• Protestently,
• Protestandly,
• protesinglty

• protesting,
• protectively,
• predestination,
• protestant,
• protection,
• protester,
• predestine,
• predestinate,
• protecting,
• protestation,
• protestantism,
• predestined,
• predestinarian.

The adjective form of "protestingly" is "protesting".