not paralleled; unequaled or unmatched; peerless; unprecedented: unparalleled athletic ability.
Also, especially British, unparallelled.

1585–95; un-1 + parallel + -ed2

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World English Dictionary
unparalleled (ʌnˈpærəˌlɛld)
unmatched; unequalled

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1594, from un- (1) "not" + pp. of parallel.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
New research partnerships are providing unparalleled opportunities.
Whatever the cause of their demise, pterosaurs enjoyed unparalleled success.
We must adjust to our unparalleled ability to shape the world's evolution.
We're talking about crystal-clear displays of unparalleled brightness that can
  also roast bratwurst.
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