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literary not able to be vanquished or overcome; unconquerable; undefeatable
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|Adj.||1.||unvanquishable - incapable of being overcome or subdued; "an invincible army"; "her invincible spirit"|
unconquerable - not capable of being conquered or vanquished or overcome; "a tribute to his courage...and his unconquerable will"- R.E.Danielson; "faced unconquerable difficulties"