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English definition of “unforeseen”

unforeseen

adjective uk   /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 from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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