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

Barring an unforeseen blowout or three, Minnich’s team isn’t likely to have to wrestle with a whole lot of make-good efforts this time around. —Anthony Crupi, Sportico.com, 8 Jan. 2026

By prioritizing impactful digital upgrades, manufacturers can best-prepare their teams to face upcoming challenges and unforeseen issues. —Atharva Gosavi, Interesting Engineering, 8 Jan. 2026

What 'unforeseen traffic issues' delayed in opening the University Avenue on-ramp? —Cooper Worth, Des Moines Register, 8 Jan. 2026

Not just because of his unique physical attributes and technical profile, but because of his largely unforeseen development. —Jacob Tanswell, New York Times, 7 Jan. 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