- reckless
- adjrash, temerarious, heedless, unheeding, careless, thoughtless, regardless, incautious; unmindful, inattentive, unwatchful, unwary, unobservant; mindless, forgetful, scatterbrained, unthinking, Sl. spaced or spacey; negligent, neglectful, remiss, slack; imprudent, uncircumspect, unwise, injudicious, ill-considered, ill-suited, ill-advised, impolitic; daring, venturous, venturesome, adventurous, daredevil, wild; brash, devil-may-care, madcap, impetuous, headlong, impulsive, hasty, overhasty, breakneck, dangerous, desperate; audacious, bold, fearless; harebrained, foolhardy, foolish, irresponsible, Inf. trigger-happy; spontaneous, spur-of-the-moment, unpremeditated, unplanned, sudden, abrupt, precipitate.
A Note on the Style of the synonym finder. 2014.