reckless

(s) 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
foolhardy, rash, heady,
(s) characterized by careless unconcern
- "the heedless generosity and the spasmodic extravagance of persons used to large fortunes"- Edith Wharton
- reckless squandering of public funds
heedless,

foolhardy rash heady heedless

recklessly recklessness