1. 
[syn: daredevil, temerarious]
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]
WordNet (r) 3.0 (2006):
temerarious
    adj 1: presumptuously daring; "a daredevil test pilot having the
           right stuff" [syn: daredevil, temerarious]