Definition of “improbable” - English Dictionary

“improbable” in British English

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improbableadjective

uk /ɪmˈprɒb.ə.bəl/ us /ɪmˈprɑː.bə.bəl/
improbably
adverb uk /ɪmˈprɒb.ə.bli/ us /ɪmˈprɑː.bə.bli/

improbably cheap prices
improbably large/long
improbability
noun [ C or U ] uk /ɪmˌprɒb.əˈbɪl.ə.ti/ us /ˌɪm.prɑː.bəˈbɪl.ə.t̬i/

(Definition of “improbable” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“improbable” in American English

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improbableadjective

us /ɪmˈprɑb·ə·bəl/

not likely to be true or to happen; not probable:

an improbable excuse
improbability
noun [ C/U ] us /ɪmˌprɑb·əˈbɪl·ɪ·t̬i/
improbably
adverb us /ɪmˈprɑb·ə·bli/

(Definition of “improbable” from the Cambridge Academic Content Dictionary © Cambridge University Press)