unvanquishable
adjEtymology From un- + vanquishable.
1
That cannot be vanquished; undefeatable, inconquerable.
- [...] if a man shall give his mind to these [i.e. stones, and herbs, and charms], he shall not only render his soul unvanquishable by passions, but shall also preserve his body the better in health: [etc.]1662, Thomas Stanley, The History of the Chaldaick Philosophy, Thomas Dring, page 52:
- Rise like Lions after slumber / In unvanquishable number1819 (date written), Percy Bysshe Shelley, The Masque of Anarchy. A Poem. […], London: Edward Moxon […], published 1832, →OCLC: