i-adjective
strong-willed; strong of heart
Describes a person with a determined, assertive, or unyielding personality. Often used for someone who does not back down easily.
See also: 気が強い
彼女は気の強い人だから、簡単にはあきらめない。
She is strong-willed, so she won't give up easily.
気の強い選手ほど、プレッシャーに負けない。
The more strong-willed the athlete, the less they succumb to pressure.