afraid — If you are afraid of someone or afraid to do something, you are frightened because you think that something very unpleasant is going to happen to you.
careful — If you are careful, you give serious attention to what you are doing, in order to avoid harm, damage, or mistakes. If you are careful to do something, you make sure that you do it.
cautious — Someone who is cautious acts very carefully in order to avoid possible danger.
cowardly — If you describe someone as cowardly, you disapprove of them because they are easily frightened and avoid doing dangerous and difficult things.
fearful — causing or apt to cause fear; frightening: a fearful apparition.