01 a. Not easily restrained; ungovernable; obstinate; stubborn.
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1.
Not easily restrained; ungovernable; obstinate; stubborn.“Now let the headstrong boy my will control.” — Dryden.
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2.
Directed by ungovernable will, or proceeding from obstinacy; as, a headstrong course.
Syn.
Violent; obstinate; ungovernable; untractable; stubborn; unruly; venturesome; heady.