If something is frightening, it makes you feel afraid, anxious, or nervous.
例句
It was a very frightening experience and they were very courageous...那段经历太恐怖了,他们表现得非常勇敢。The number of youngsters involved in crime is frightening.年轻人犯罪的人数多得骇人。
英英词典释义
Adverb
1. in an alarming manner;
"the disturbing thing about the Minister's behavior is that far from being artificial, it too often rings frighteningly true"