Collocations for apprehensive - adj.

be, feel, look, seem, sound
become, get, grow
remain
make sb
The long delay had made me quite apprehensive.

extremely, fairly, very, etc.
deeply (esp. BrE)
a little, slightly, etc.

about
She was extremely apprehensive about her future.

of
He was rather apprehensive of failure.

Apprehensive is used with these nouns:
look