1. In an incredible manner.

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

• increadebly,
• indredible,
• incredibale,
• increddible,
• incredibles,
• incrediable,
• incridably,
• increadiably,
• incredibely,
• incredable,
• incredaible,
• increidible,
• incradible,
• encredible,
• incredabily,
• increadibly,
• increadably,
• incdredible,
• incredidle,
• increditble

• incredulously,
• increase,
• increased,
• ingrained,
• increasing,
• increasingly,
• inscribed,
• ingredient,
• injured,
• insured,
• incredulity,
• incredibility,
• incredible.

The adjective form of the word "incredibly" is "incredible".