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English definition of “unrealistic”

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unrealistic

adjective uk   /ˌʌn.rɪəˈlɪs.tɪk/ us    /-riː.ə-/
B2 having a wrong idea of what is likely to happen or of what you can really do; not based on facts: I think these sales forecasts are unrealistic, considering how slow sales are at present. [+ to infinitive] It's unrealistic to expect an answer before next week.
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unrealistically
adverb uk   /-tɪ.kəl.i/ us  
(Definition of unrealistic from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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