1. 
[syn: foolhardy, heady, rash, reckless]
The Collaborative International Dictionary of English v.0.48:
Foolhardy \Fool"har`dy\, a. [OF. folhardi. See Fool idiot, and
   Hardy.]
   Daring without judgment; foolishly adventurous and bold.
   --Howell.
   Syn: Rash; venturesome; venturous; precipitate; reckless;
        headlong; incautious. See Rash.
        [1913 Webster]
WordNet (r) 3.0 (2006):
foolhardy
    adj 1: 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" [syn: foolhardy, heady,
           rash, reckless]
Moby Thesaurus II by Grady Ward, 1.0:
40 Moby Thesaurus words for "foolhardy":
   adventuresome, adventurous, audacious, bold, brash, careless,
   cheeky, daredevil, daring, death-defying, devil-may-care,
   enterprising, fire-eating, forward, gutsy, harebrained, hasty,
   headlong, heedless, hotheaded, impetuous, imprudent, incautious,
   irresponsible, madbrain, madbrained, madcap, nervy, overbold,
   precipitate, presumptuous, rash, reckless, temerarious,
   thoughtless, unthinking, venturesome, venturous, wild, wild-ass