Definition of heady

• marked by the exercise of good judgment or common sense in practical matters; "judicious use of ones money"; "a wise decision"
• extremely exciting as if by alcohol or a narcotic
• 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"