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

The dismissals continue a nearly unprecedented streak of legal defeats for the U.S.

From Los Angeles Times

The national police chief branded the case an "unprecedented crime" unlike any other seen before in the country.

From BBC

A Palace spokesperson said: "The King has made clear, in words and through unprecedented actions, his profound concern at allegations which continue to come to light in respect of Mr Mountbatten-Windsor's conduct."

From BBC

The Ukrainian leader has seen his approval ratings gradually dip from unprecedented levels at the beginning of the invasion nearly four years ago.

From Barron's

James is playing in his unprecedented 23rd season.

From Los Angeles Times

Related Words

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