The definition of headstrong is someone who is stubborn, likes things his own way, imposes his opinion or is unyielding in his opinions and beliefs.
(adjective)An example of a headstrong person is someone who knows her own mind and who is determined to have her own way.
See headstrong in Webster's New World College Dictionary
adjective
Origin: ME heedstronge: see head & strong
See headstrong in American Heritage Dictionary 4
Learn more about headstrong