1.Scary: frightening 恐怖的;吓人的 adjective informal
It was a really scary moment. 那一刻真是吓人.
a scary movie 恐怖电影
2.Panic: to suddenly feel frightened so that you cannot think clearly and you say or do something stupid, dangerous, etc.; to make somebody do this (使)惊慌,惊慌失措
I panicked when I saw smoke coming out of the engine. 我看见发动机冒烟时,吓得手足无措.
The gunfire panicked the horses. 枪声惊吓到马匹.
3.Horrifying: making you feel extremely shocked, disgusted or frightened 令人极其震惊的(或厌恶的、恐惧的)
a horrifying sight/experience/story 恐怖的景象╱经历╱故事
It's horrifying to see such poverty. 看到这种贫困状况令人震惊.