Synonyms of unexpected

unexpected

adjective

ˌən-ik-ˈspek-təd 

as in sudden

not expected

the failure of the backup generator was unexpected and a contingency for which we weren't prepared

Synonyms & Similar Words

• sudden
• unanticipated
• unforeseen
• abrupt
• unlooked-for
• unlikely
• unplanned
• improbable
• surprising
• startling
• unintended

Antonyms & Near Antonyms

• anticipated
• expected
• foreseen
• predicted
• unsurprising
• prophesied

Example Sentences

Recent Examples of unexpected

Last week, OpenAI disclosed several instances from the summer in which its agents acted in unexpected ways while searching federal government websites. — Kelvin Chan, Los Angeles Times, 29 Sep. 2026

Use opt-in SMS across brand, product and service experiences to surface friction, unexpected behavior and unarticulated needs that inform innovation. — Expert Panel®, Forbes.com, 29 Sep. 2026

That growth hasn’t always been linear, as the girls have experienced some unexpected changes these past several months, including the hiatus of fellow members Sophia Laforteza and Manon Bannerman. — Alicia Urrea, Billboard, 28 Sep. 2026

Designers played with new silhouettes, asymmetric hemlines and handcrafted details, transforming traditional Italian craft into something more unexpected and modern. — Samantha Conti, Footwear News, 28 Sep. 2026