If you are scared of someone or something, you are frightened of them. I'm certainly not scared of him I was too scared to move Why are you so scared? = frightened
If you are scared that something unpleasant might happen, you are nervous and worried because you think that it might happen. I was scared that I might be sick He was scared of letting us down. = worried. frightened of something, or nervous about something = afraid
made afraid; "the frightened child cowered in the corner"; "too shocked and scared to move"