Hĕad'strŏng, a.
(hĕd'strŏng), a. 1. Not easily restrained; ungovernable; obstinate.
Now let the headstrong boy my will control. Dryden.
Sense 2. Directed by ungovernable will, or proceeding from obstinacy; as, a headstrong course. Dryden.
Synonyms— Violent; obstinate; ungovernable; untractable; stubborn; unruly; venturesome; heady.