Frighten
Definition 1 of 2
Pro Tip 1/3
Intensity Varies
Frighten can mean slightly scared to very scared, depending on context. The spooky story didn't really frighten me, just made me a bit uneasy.
Pro Tip 2/3
Not Always Real
Frighten doesn't require a real threat, imagined ones work too. She was frightened by the shadows, even though they were harmless.
Pro Tip 3/3
Physical Response
Being frightened can cause a physical reaction, like jumping or screaming. He was so frightened that he leapt from his seat.