HEADSTRONG, adjective hed'strong. Violent; obstinate; ungovernable; resolute to run his own way; bent on pursuing his own will; not easily restrained. Now let the headstrong boy my will control. 1. Directed by ungovernable will or proceeding from obstinacy; as a headstrong course.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI