The phrase "more spine-chilling" can be used to describe something that is extremely scary or frightening. There are several synonyms for this phrase that can be used to convey a similar meaning. Words like "terrifying," "horrifying," "petrifying," "hair-raising," and "chilling" can all be used to describe a situation that is more spine-chilling. These words describe something that makes your blood run cold and sends shivers down your spine. Whether it's a creepy ghost story, a horror movie, or a terrifying experience, using synonyms for "more spine-chilling" can help to create a more vivid and evocative picture of the situation.