indomitable spirit/will/courage etc• Alice Fernie was a woman of indomitable spirit.• Her indomitable spirit is testament enough to her working class, Liverpudlianroots.• None of his victories was more characteristic of his indomitable will to win than his first success in the Arlington Million.• The chiefinspector suddenly understood that the historian's self-important but indomitable spirit was housed in a broken body.
Originindomitable
(1600-1700)Late Latinindomitabilis, from Latindomitare“to control the behavior of”