un ‧ cer ‧ tain /ʌnˈsɜːtn $ -ɜːr-/ BrE AmE adjective
[ Word Family: noun : ↑ certainty ≠ ↑ uncertainty ; adverb : ↑ certainly ≠ ↑ uncertainly ; adjective : ↑ certain ≠ ↑ uncertain ]
1 . [not before noun] feeling doubt about something SYN 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 SYN 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 SYN unsteady :
She took a few uncertain steps forward.
—uncertainly adverb