1. In an insane manner; foolishly.

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

• insanley,
• insantly,
• insantiy,
• insaneity,
• insainly,
• instanlly,
• incanly,
• insainely,
• insantily,
• insanly,
• instanly,
• insanty,
• insaniety,
• ineanely,
• insaney,
• insafely,
• Insisely,
• insafey,
• insaftey,
• Insanebly

• insaneness,
• insanity,
• Incan,
• inconel,
• insane,
• insanitary.

The adjective form of the word "insanely" is "insane".

The plural form of "insanely" remains the same, as it does not change when referring to multiple instances or quantities.

The singular form of the word "insanely" is "insane"