reckless

Etymology

From Middle English rekles, reckeles, rekkeles, (also recheles), from Old English rēcelēas (“reckless, careless, negligent”), equivalent to reck + -less. Cognate with West Frisian roekeleas (“reckless”), Dutch roekeloos (“reckless”), German Low German ruuklos (“careless”), German ruchlos (“careless, notorious”).

adj

1. Careless or heedless; headstrong or rash.
2. Indifferent or oblivious to danger or the consequences thereof.
   Escalation is the film’s nuclear energy source. It’s there, of course, in the downright lunatic stunts performed by [Tom] Cruise, again defying good sense and his own advancing years to top his previous feats of reckless self-endangerment. 25 July 2018, A. A. Dowd, “Fallout may be the Most Breathlessly Intense Mission: Impossible Adventure Yet”, in The A.V. Club, archived from the original on 2018-07-31