Definition of unexpected adjective from the Oxford Advanced American Dictionary

  

unexpected

 adjective
adjective
NAmE//ˌʌnɪkˈspɛktəd//
 
 
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 if something is unexpected, it surprises you because you were not expecting it an unexpected result an unexpected visitor The announcement was not entirely unexpected.
the unexpectednoun[singular]
 
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Police officers must be prepared for the unexpected.
unexpectedly
 
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adverb They had arrived unexpectedly. an unexpectedly large bill The plane was unexpectedly delayed. Not unexpectedly, most local business depends on tourism. She died unexpectedly of a heart attack.
unexpectedness
 
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noun [uncountable] compare expect, expected
See the Oxford Advanced Learner's Dictionary entry: unexpected