Longman Dictionary of Contemporary English homepage

uncertain

 adjective
     
un‧cer‧tain
1 [not before noun] feeling doubt about something [= unsure]
uncertain whether/how/what etc
He was uncertain how much further he could walk.
uncertain about/of
I was uncertain about what to do next.
2 not clear, definite, or decided [= unclear]
It is uncertain whether/how/what etc
It is uncertain how likely this is to occur.
My whole future now seemed uncertain.
3

in no uncertain terms

if you tell someone something in no uncertain terms, you tell them very clearly without trying to be polite:
I told Colin in no uncertain terms what I thought of him.
4 if someone walks in an uncertain way, they seem as though they might fall:
She took a few uncertain steps forward.
—uncertainly adverb
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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