unparalleled

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
1

adj radically distinctive and without equal

unparalleled athletic ability”
“a breakdown of law unparalleled in our history”
Synonyms:
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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