[adjective] [+ wh- word] - (of a person) not knowing what to do or believe, or (of a situation) not fixed or able to be completely knownShe's uncertain whether to go to New Zealand or not.Ever since we heard the rumour that the factory might be closing, we've been uncertain of our position.New arrivals face an uncertain future.The political outlook is still uncertain.The weather is rather uncertain at the moment,I'm afraid he does have a bit of an uncertain temper (= his moods can change suddenly).
UNCERTAIN
Meaning of UNCERTAIN in English
Cambridge English vocab. Кембриджский английский словарь. 2012