temerarious

Presumptuously or recklessly bold; rash or reckless: synonym: reckless.

Heedless or careless of consequences; unreasonably venturous; reckless; headstrong; inconsiderate; rash; careless.

Unreasonably adventurous; despising danger; rash; headstrong; audacious; reckless; heedless.

Recklessly daring or bold.

Presumptuously daring.