Meaning of “dubious” in the English Dictionary

"dubious" in English

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uk /ˈdʒuː.bi.əs/ us /ˈduː.bi.əs/

C2 thought not to be completely true or not able to be trusted:

These claims are dubious and not scientifically proven.
He has been associated with some dubious characters.
Ruth Ellis has the dubious (= bad) distinction of being the last woman to be hanged in Britain.

C2 feeling doubt or not feeling certain:

I'm dubious about his promises to change his ways.

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adverb uk /ˈdʒuː.bi.ə us /ˈduː.bi.ə

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

"dubious" in American English

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us /ˈdu·bi·əs/

probably not true or not completely true; doubtful:

The team had the dubious distinction of ranking 31st in the league.

Dubious can also mean not to be trusted, or not completely moral:

a dubious character

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