bloodcurdling adj. Causing sudden intense fear due to an apprehension of imminent bodily harm, to oneself or others. "Awakened by a bloodcurdling scream from right outside her window"
... the grim answer. "But we must never allow such a bloodcurdling thing to happen. It wouldn't be right. I want you to go right over to Eveley's as fast as you can, and make her marry you. You can pretend you do not know anything about this, and sweep her right off her feet. Get her promise before she knows what is going on, and marry her before ... — Eve to the Rescue • Ethel Hueston