heady -
marked by defiant disregard for danger or consequences; "foolhardy enough to try to seize the gun from the hijacker"; "became the fiercest and most reckless of partisans"-Macaulay; "a reckless driver"; "a rash attempt to climb Mount Everest"
prudent careful and sensible; marked by sound judgment; "a prudent manager"; "prudent rulers"; "prudent hesitation"; "more prudent to hide than to fight"