If something's unparalleled, there's never been anything like it — such as a brilliant musical performance or a record-breaking time for an athlete.

Remember parallel lines from your old geometry classes — lines running alongside each other always at the same distance that never meet and are essentially identical? Well, that's the idea unparalleled comes from — except the opposite (thus the "un"). Sporting achievements are particularly prone to being described as unparalleled, since athletes are always out to break records.

Definitions of unparalleled

adj radically distinctive and without equal

unparalleled athletic ability”
“a breakdown of law unparalleled in our history”
alone, unequaled, unequalled, unique
incomparable, uncomparable
such that comparison is impossible; unsuitable for comparison or lacking features that can be compared

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