indomitable

adj

1. Incapable of being subdued, overcome, or vanquished.

   “Personal courage and an indomitable self-confidence were the chief, indeed the only, qualities which sprang to light in General Feversham.”

   “But he was a youth of indomitable spirit, strong and agile as a wild cat.”

   “Nobody came on to the movie camera—wrapped it in a bear hug and wrestled it to submission—like Betty Hutton. They called this 40s singer-actress "the Blitzkrieg blond" . . . . [S]he was indomitable, unstoppable.”

   “And even though the rest of the auto industry, seeing Tesla’s growth, jumped on the electric vehicle bandwagon, Tesla has maintained an indomitable lead.”

   “[Elle] Fanning channels stress, anger and the exhaustion of new motherhood without losing Margo’s indomitable spirit.”