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English definition of “improbable”

improbable

adjective     /ɪmˈprɒb.ə.bl̩/ US  /-ˈprɑː.bə-/
not likely to happen or be true : It's highly improbable that Norris will agree . an improbable-sounding excuse Impossible and improbable improbably     /-bli/ adverb improbably cheap prices improbably large / long Impossible and improbable improbability     /ɪmˌprɒb.əˈbɪl.ɪ.ti/ US  /ˌɪm.prɑː.bəˈbɪl.ə.t̬i/ noun [C or U] Impossible and improbable
(Definition of improbable adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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