adjective un·van·quish·able \¦ən¦vaŋkwishəbəl, -ank-\

Definition of unvanquishable

  1. :  incapable of being subdued :  unconquerable

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Origin and Etymology of unvanquishable

Middle English unvenkusable, from 1un- + venkussen, venquissen to vanquish + -able

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a trip made at another's expense

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