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

These unforeseen consequences end up transforming intellectual life. — Rose Horowitch, The Atlantic, 8 July 2026

Before every project hits the factory floor, a computer analysis calculates every cut and sorts out unforeseen hitches that can bring traditional projects to a halt such as conflicts between plumbing lines and bearing walls, Glenn said. — Los Angeles Times, 7 July 2026

The nightcap for this dance party of an album takes an honest look at the unforeseen pitfalls and points where success was not a certainty. — Craig Jenkins, Vulture, 6 July 2026

Weather delays and unforeseen conditions could modify the schedule and traffic control signing patterns. — Sean Krofssik, Hartford Courant, 6 July 2026

Word History

First Known Use

1651, in the meaning defined above

Rhymes for unforeseen

• acetylene
• adamantine
• adenosine
• amphetamine
• anthropocene
• apoprotein
• aquamarine
• arsphenamine
• azobenzene
• buprenorphine
• catecholamine
• chlorobenzene