B2 not knowing what to do or believe, or not able to decide about something拿不定主意的,犹豫的
B2 not known or fixed, or not completely certain未知的;不确定的;不完全确定的
More examples
Torn apart by war, the country now faces a very uncertain future.
The team's continued involvement in the competition is uncertain.
He was uncertain as to which road to take.
I'm uncertain about what to do next.
How they managed to gain entry to the building is uncertain.
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