Determined to have one's own way; stubbornly and often recklessly willful. See Synonyms at obstinate, unruly.(adjective)
Resulting from willfulness and obstinacy.(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "headstrong" in a sentence
"The only way this can be done practically, though, is if Sarah receives a rollback, a brand new rejuvenation technique that can only be afforded to the rich and powerful - like a certain headstrong millionaire."
"Both are known as headstrong leaders unaccustomed to sharing power."
"But I felt that it was clear that the least want of firmness at the outset would endanger my whole educational plan; therefore, I stood firm, and indeed gained my point, though at the price of being called headstrong, self-willed, and stubborn."