temerarious

from WordNet (r) 3.0 (2006)

temerarious
    adj 1: presumptuously daring; "a daredevil test pilot having the
           right stuff" [syn: {daredevil}, {temerarious}]

from The Collaborative International Dictionary of English v.0.48

Temerarious \Tem`er*a"ri*ous\, a. [L. temerarius. See
   {Temerity}.]
   Unreasonably adventurous; despising danger; rash; headstrong;
   audacious; reckless; heedless. -- {Tem`er*a"ri*ous*ly}, adv.
   [1913 Webster]

         I spake against temerarious judgment.    --Latimer.
   [1913 Webster]