The word for today is…
indomitable (adjective):
: incapable of being subdued
Source : Merriam -Webster
Etymology : The prefix in- means “not” in numerous English words (think of indecent, indecisive, inconvenient, and infallible). When in- teamed up with the Latin domitare (“to tame”), the result was a word meaning “unable to be tamed.” Indomitable was first used in English in the 1600s as a synonym of wild, but over time the wildness associated with indomitable developed into a specific kind of strength. By the 1800s, indomitable was being used for people whose courage and persistence helped them to succeed in difficult situations.
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