Uncle Tom’s Cabin vocabulary

But at front and rear, unawed and indomitable, toiled the two men who were not yet dead.

Jack London. White Fang (1915)

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 she had taken her shoes off, and her stockings were by now torn off her feet. She felt neither soreness nor weariness; indomitable will to reach her husband in spite of adverse Fate, and of a cunning enemy, killed all sense of bodily pain within her, and rendered her instincts doubly acute.

Baroness Emmuska Orczy. The Scarlet Pimpernel (1905)