Synonyms of unprecedented

unprecedented

adjective

ˌən-ˈpre-sə-ˌden-təd 

as in novel

not known or experienced before

this is an unprecedented request for the reference desk

Synonyms & Similar Words

• novel
• new
• strange
• unfamiliar
• fresh
• unheard-of
• original
• unknown
• unique
• unaccustomed
• innovative
• unconventional
• pioneering
• nontraditional
• untried
• unused
• trailblazing
• pathbreaking
• unworn

Antonyms & Near Antonyms

• familiar
• old
• hackneyed
• traditional
• tired
• conventional
• established
• time-honored
• tried
• derivative
• warmed-over
• imitative
• tried-and-true

Example Sentences

Recent Examples of unprecedented

Recall replacement protocol Filling Perkins’ vacant seat will be an unprecedented challenge for the city of Independence, as his removal Tuesday night was the first time a city official has been recalled by referendum in the city’s history. — Ilana Arougheti, Kansas City Star, 2 Sep. 2026

The strikes marked a sixth straight day of heavy Russian attacks on Kyiv, an assault unprecedented since Russia launched the full-scale invasion of its neighbor more than 4½ years ago. — Samya Kullab, Los Angeles Times, 1 Sep. 2026

Indeed, fragrance launches have proliferated since the category’s unprecedented post-COVID-19 boom, as have channels. — Noor Lobad, Footwear News, 1 Sep. 2026

Driscoll also warned the White House about unprecedented efforts by Hegseth to block others from advancing into the military's highest ranks after they had been thoroughly vetted, the sources said. — Luis Martinez, ABC News, 1 Sep. 2026