Collocations for insecure - adj.

appear, be, feel, look, seem
become, grow
remain

extremely, fairly, very, etc.
deeply, totally (esp. AmE)
increasingly
a little, slightly, etc.
economically, financially
men who are worried about losing their jobs and becoming financially insecure

notoriously
a star who is notoriously insecure about her looks

about
He felt a little insecure about being left alone.