unprecedented

American  

[uhn-pres-i-den-tid] / ʌnˈprɛs ɪˌdɛn tɪd /

adjective

1. without previous instance; never before known or experienced; unexampled or unparalleled.

   an unprecedented event.

   Synonyms:

   novel, exceptional, extraordinary, unique

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unprecedented British  

/ ʌnˈprɛsɪˌdɛntɪd /

adjective

1. having no precedent; unparalleled

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Other Word Forms

• unprecedentedly adverb
• unprecedentedness noun

Etymology

Origin of unprecedented

First recorded in 1615–25; un- ¹ + precedent + -ed ²

Example Sentences

That’s driven unprecedented interest in Korean markets: A BofA report just flagged the biggest weekly inflow ever to South Korean equities.

From MarketWatch

The university said it admitted no liability and had "worked diligently to deliver teaching and student support in unprecedented circumstances".

From BBC

The FDA’s powerful drug division has had five leaders in the past year, contributing to an unprecedented level of turmoil at the agency responsible for ensuring the drugs Americans take are safe and effective.

From The Wall Street Journal

He was put under unprecedented pressure to slash short-term rates prematurely.

From MarketWatch

Having 33% of your money in seven companies—which is high, although not unprecedented, by historical standards—sounds a lot like too many eggs in too few baskets.

From The Wall Street Journal

Related Words

• bizarre
• extraordinary
• fantastic
• miraculous
• new
• remarkable
• singular
• uncommon
• unheard-of
• unique
• unparalleled
• unrivaled
• unusual