foolhardiness.

A willingness to take risks without giving enough thought to danger or consequences.

Use it for

Words that belong together

• sheer foolhardiness
• an act of foolhardiness

On the page

Entering the flooded tunnel alone was not courage but foolhardiness.

Usage notes

Primary category: psychology / human behavior. Forms: usually uncountable; no ordinary plural. Writing functions: judgment, character, risk. Commonness: moderately common. Established independent noun, not an inflected adjective.