unforeseen

adjective

un·​fore·​seen ˌən-fȯr-ˈsēn 

: not anticipated or expected : not foreseen : unexpected

an unforeseen delay

unforeseen consequences

Synonyms of unforeseen

• sudden
• unexpected

Examples of unforeseen in a Sentence

there are almost always unforeseen consequences for any major endeavor

unforeseen problems delayed the project beyond its deadline

Recent Examples on the Web

There’s something to be said for the persistence of these artists in grinding through and realizing such elaborate historical films in the face of enormous, unforeseen, catastrophic logistical challenges. —Bilge Ebiri, Vulture, 20 Mar. 2026

Englewood officials said their contract with Denver reflected conditions at the time and noted that the pandemic, and the subsequent spike in inflation were unforeseen. —Brian Maass, CBS News, 18 Mar. 2026

Handling unforeseen issues on the ground is a cornerstone of my personalized service. —Condé Nast, Condé Nast Traveler, 17 Mar. 2026

Whether traveling by car, plane or even internationally, unforeseen circumstances can throw a wrench into plans. —Dr. Katherine Williamson, Boston Herald, 15 Mar. 2026

Word History

First Known Use

1651, in the meaning defined above

Rhymes for unforeseen

• acetylene
• adenosine
• amphetamine
• anthropocene
• antipyrine
• apomorphine
• apoprotein
• aquamarine
• arsphenamine
• azobenzene
• buprenorphine
• chlorobenzene