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Definitions

unprecedented

[uhn-pres-i-den-tid] / ʌnˈprɛs ɪˌdɛn tɪd /
ADJECTIVE
exceptional, original
Synonyms
STRONGEST
bizarre extraordinary fantastic miraculous new remarkable singular uncommon unheard-of unique unparalleled unrivaled unusual
WEAK
aberrant abnormal anomalous eccentric exotic freakish idiosyncratic marvelous modern newfangled novel odd out-of-the-way outlandish outre outré preternatural prodigious signal sui generis unexampled
Antonyms
STRONGEST
bad common commonplace customary familiar normal ordinary poor regular standard usual
WEAK
known unexceptional unremarkable

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The effective closure of the Strait of Hormuz is unprecedented.

From Barron's • Apr. 8, 2026

The unprecedented quantity and detail of battlefield data requires changes to how intelligence is collected, analyzed and disseminated.

From The Wall Street Journal • Apr. 7, 2026

"This ancient immigrant gives us an unprecedented look at conditions in the early universe," said Ji.

From Science Daily • Apr. 4, 2026

In an effort to put a dent in the state’s housing shortage, California is considering something unprecedented: getting into the construction insurance business.

From Los Angeles Times • Apr. 3, 2026

The articles included scientific language and specific details about the telescope’s unprecedented power.

From "Spooked!" by Gail Jarrow