Collocations for uncertain - adj.

be, feel, look, seem, sound
become
leave sb
His research into the incident has left him uncertain as to exactly where responsibility lay.

make sb

deeply (esp. BrE), very
I feel deeply uncertain about the future.

rather, somewhat
a little, slightly, etc.

about, as to
He seemed strangely uncertain as to how to continue.

of
We were rather uncertain of the direction it came from.

be, look
become
remain, seem
make sth
immigration policies that made employment status uncertain

extremely, fairly, very, etc.
highly
Cost estimates are highly uncertain in this business.

increasingly
still
Whether diet is an important factor in this illness is still uncertain.

inherently
The world is inherently uncertain.

Uncertain is used with these nouns:
environment, fate, future, nature, outlook, start, weather