wanton adj: 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 act] [by such or willful misconduct] see also reckless NOTE: Wantonreckless, 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.
Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.