Meaning of “uncertain” in the English Dictionary

"uncertain" in British English

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uk /ʌnˈsɜː.tən/ us /ʌnˈsɝː.tən/

B2 not knowing what to do or believe, or not able to decide about something:

[ + question word ] She's uncertain whether to go to New Zealand or not.
Ariana was uncertain about meeting him.

B2 not known or fixed, or not completely certain:

These refugees face an uncertain future.
The political outlook is still uncertain.

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adverb uk /ʌnˈsɜː.tə us /ʌnˈsɝː.tə

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

"uncertain" in American English

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uncertainadjective [ not gradable ]

us /ʌnˈsɜr·tən/

unclear, or not sure:

She faces an uncertain future.
We’re uncertain of the cause of death.
noun [ C/U ] us /ʌnˈsɜr·tən·ti/

[ U ] They live in uncertainty and confusion.

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