uncertain · adjective /ʌnˈsɜː.tən/Full view
Nouns: certainty, uncertainty
Adjectives: certain, uncertain
Adverbs: certainly, uncertainly
uncertain (NOT SURE)
B2 not sure or not able to decide about something
Dictionary examples:

She's uncertain whether to go to New Zealand or not.

Bridie was uncertain about meeting him.

Learner example:

[There are] things that I am uncertain about, and [that I would] be grateful if you c[ould] explain. (First Certificate in English; B2; Chinese)

uncertain (NOT KNOWN)
B2 not known or fixed, or not completely certain
Dictionary examples:

New arrivals face an uncertain future.

The political outlook is still uncertain.

Learner example:

Please do not bother posting them since we do not have a zip code where I live, and they might get lost with our uncertain Post Service. (First Certificate in English; B2; Spanish)

in no uncertain terms
C2 in a direct and often angry way
Dictionary example:

I told him to go away in no uncertain terms.

Learner example:

Intellectuals are used to saying in no uncertain terms that money represents the bad side of the sport. (Certificate of Proficiency in English; C2; French)

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