primal fear
The highest level of fear that most people do not experience. This can also be related to the feeling of impending predation. Primal fear is your survival instincts at work.
"Every muscle in his body was tense, and this was no normal fear, this was a primal fear, he subconsciously knew he was being hunted"
primal fear
An instinctive fear that has been common to humanity throughout time, possibly invoking a fight or flight response in some, or a deep trembling feeling of anxiety in others.
He felt a sensation of primal fear go through his body, as he stood in the psychopath's presence. It was as if he had just stared evil right in the face.