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inconceivable

adjective
 
 
/ˌɪn.kənˈsiː.və.bl̩/

Definition

C2 impossible to imagine or think of: The idea that they might not win was inconceivable to them. It would be inconceivable for her to change her mind.Not expected or planned extremely unlikely: Another nuclear accident in the same place is virtually/almost inconceivable. It is not inconceivable (= it is possible) that she could be lying.Not expected or planned inconceivably
 
 
/-bli/ adverb
Not expected or planned
(Definition of inconceivable adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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