headstrong
adjective C1- Determined to do as one pleases, and not as others want. · He was in that headstrong teenage phase when he felt like he knew everything.
From the library
The Horse chose his earliest years and gave them his own attributes: hence every man is in his youth impetuous, headstrong, and obstinate in maintaining his own opinion.
She is a very headstrong, foolish girl, and does not know her own interest; but I will _make_ her know it.”
Collins; “but if she is really headstrong and foolish, I know not whether she would altogether be a very desirable wife to a man in my situation, who naturally looks for happiness in the marriage state.
“Lizzy is only headstrong in such matters as these.
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