headstrong

from WordNet (r) 3.0 (2006)
headstrong
    adj 1: habitually disposed to disobedience and opposition [syn:
           {froward}, {headstrong}, {self-willed}, {willful},
           {wilful}]
    
from The Collaborative International Dictionary of English v.0.48
Headstrong \Head"strong`\ (-str[o^]ng`; 115), a.
   1. Not easily restrained; ungovernable; obstinate; stubborn.
      [1913 Webster]

            Now let the headstrong boy my will control.
                                                  --Dryden.
      [1913 Webster]

   2. Directed by ungovernable will, or proceeding from
      obstinacy; as, a headstrong course. --Dryden.

   Syn: Violent; obstinate; ungovernable; untractable; stubborn;
        unruly; venturesome; heady.
        [1913 Webster]
    
from Moby Thesaurus II by Grady Ward, 1.0
53 Moby Thesaurus words for "headstrong":
      balking, balky, bigoted, bulldogged, bulletheaded, bullheaded,
      case-hardened, disobedient, dogged, dogmatic, fanatic, hardheaded,
      heady, insubordinate, intolerant, irresponsible, lawless,
      licentious, mulish, mutinous, obstinate, opinionated, overzealous,
      persevering, pertinacious, pigheaded, rampant, refractory,
      reinless, restive, self-willed, set, stiff-necked, strong-willed,
      strongheaded, stubborn, sulky, sullen, tenacious, unaccountable,
      unbridled, unchecked, uncontrolled, uncooperative, uncurbed,
      undisciplined, ungoverned, unregenerate, unreined, unrestrained,
      wildcat, willful, wrongheaded

    

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