scaredy-cat

A scaredy-cat is someone who is excessively fearful on a regular basis and usually scared quite easily and often. This slang term for someone always scared is often used for someone whose personality is mostly timid and shy as this type of person will often be frightened of nearly anything, even their own shadow in some cases. While this seems extreme, scaredy-cats literally jump and get startled from seeing their own shadow thinking it is someone else.