This is the 16360th most frequent Korean word.
비정상적인
"Abnormal" or "irregular."
In this instance, '비정상적인' specifies the noise to be out of the ordinary.
비정상적인 소음이 이곳에서 들렸다.
Abnormal noise was heard here.
The word '비정상적인' is used to describe behavior that deviates from typical or expected norms.
그의 행동은 정말 비정상적이었다.
His behavior was really abnormal.
Here, '비정상적인' modifies '날씨' to indicate unusual weather conditions.