expression, i-adjective
strong-willed; tough-minded; assertive
Describes a person with a forceful, unyielding personality; often used for someone who is not easily intimidated. Can carry a slightly negative nuance of being headstrong or overbearing depending on context.
See also: 気の強い
彼女は気が強いから、誰にも負けない。
She is strong-willed, so she won't lose to anyone.
It's tough to argue with a strong-willed person.