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English definition of “unforeseen”

unforeseen

adjective     /ˌʌn.fəˈsiːn/ US  /-fɚ-/
C1 not expected: Due to unforeseen circumstances the cost of the improvements has risen by 20 percent. Unless there are any unforeseen problems the whole project should be finished by the spring.Not expected or planned
(Definition of unforeseen adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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