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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 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

That is high for an aerospace and defense company, but not unprecedented.

From Barron's • Apr. 3, 2026

Meg's death came months before an "unprecedented" outbreak of MenB in Kent, which resulted in the deaths of two young people.

From BBC • Apr. 3, 2026

Indeed, the year 1936 introduced a string of technical improvements yielding higher energies, higher currents, and unprecedented reliability.

From "Big Science" by Michael Hiltzik