Diffident, faint-hearted (5)
I believe the answer is:
timid
I believe this is a double definition.
'diffident' is the first definition.
(I know that diffident can be written as timid)
'faint-hearted' is the second definition.
(I know that fainthearted can be written as timid)
(Other definitions for timid that I've seen before include "Not brave" , "Easily frightened" , "Fearful - shy" , "Easily scared" , "Easily alarmed, shy" .)