wanton
adjective | \ ˈwänt-ᵊn, ˈwȯnt- \ | wan·ton
-
: manifesting extreme indifference to a risk of injury to another that is known or should have been known : characterized by knowledge of and utter disregard for probability of resulting harm a wanton act by such wanton or willful misconduct — see also reckless
Note: Wanton reckless, and willful are often used to refer to an aggravated level of negligence that borders on intent and that is often ground for an award of punitive damages.