Collocations for unsure - adj.

be, feel, look, seem, sound
I felt a little unsure about him.

remain
leave sb, make sb
His sudden change of heart left Brenda unsure once more.

extremely, fairly, very, etc.
completely, totally
a little, slightly, etc.
clearly, obviously
genuinely
still

about
If you're still unsure about what you are supposed to do, speak up!

as to
We were unsure as to what to do next.

of
She was rather unsure of her reception.