What does unexpected mean?
Unexpected describes something that differs from what was expected, anticipated, or believed likely to happen. It is especially useful for events, results, changes, and difficulties that arrive without warning or contradict established expectations. The word is emotionally flexible: an unexpected gift or discovery may be welcome, while an unexpected problem or interruption is usually disruptive. In everyday use, unexpected often carries the implication that something has departed from a plan or assumption, though it does not necessarily mean that the event is negative. The closely related adverb unexpectedly describes how an action or event occurs, as in “The train was unexpectedly full.” Together, these forms provide a concise way to identify surprises and departures from expectation without implying that every surprise is either desirable or undesirable.
adjectiveNot expected, anticipated, or foreseen; different from what one believed would happen.
- Contrary to what was expected, anticipated, or foreseen.
- Not intended or wanted.
"The researchers made an unexpected discovery that changed their understanding of the problem."
"An unexpected change in the weather forced them to abandon the hike."
"The film was praised for its unexpected mixture of comedy and drama."
Expected comes from a Latin word meaning “to look out for,” so an unexpected event is literally one nobody was looking out for.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does unexpected come from?
Unexpected arose in early modern English from the prefix un-, meaning “not,” and the past participle expected. Expected ultimately comes through Old French expecter from Latin exspectare, formed from ex-, meaning “out,” and specere, meaning “to look,” and therefore literally expressed the idea of looking out for something. The same root underlies words such as expect, expectant, and expectation, while un- reverses the notion of anticipation.
Related word forms
How unexpected is actually used
This is a neutral, widely used adjective. It can describe welcome surprises as well as unwelcome developments, and it often appears with nouns such as result, event, development, problem, and guest.
Easily confused with unexpected
Unforeseen focuses on something not known or predicted in advance, whereas unexpected can also imply that an event or circumstance is surprising or disruptive.