Both Uses

indomitable
in
Harriet Tubman, by Petry
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She gave the impression of being a short, muscular, indomitable woman who could never be defeated.†
Chpt 15 *
Despite her work as a nurse, a scout, and a spy, in the Civil War, she will be remembered longest as a conductor on the Underground Railroad, the railroad to freedom—a short, indomitable woman, sustained by faith in a living God, inspired by the belief that freedom was a right all men should enjoy, leading bands of trembling fugitives out of Tidewater Maryland.†
Chpt 22

Definitions:

(1) (indomitable)
impossible to defeat or discourage; or showing unshakable strength, determination, or spirit
(2) (meaning too rare to warrant focus)