frightening

adj

1. Causing fear; or capable of causing fear; scary.

   “Riding the rollercoaster was a frightening experience.”

   “The Owl is flying high, frightening to the eye. The Rattler is nearby, Cool is on the fly. Danger is his business.”

2. (figuratively)Awful, terrible, very bad.

verb

1. (form-of, gerund, participle, present)present participle and gerund of frighten

   “The scientist was frightening the timid children.”