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comparative more unvanquishable, superlative most unvanquishable
That cannot be vanquished; undefeatable, inconquerable. quotations examples
[...] 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