This is the 3828th most frequent Korean word.
심상치
"Unusual" or "not ordinary."
심상치 않다 is used to describe an unusual or ominous state in this sentence.
상황이 심상치 않다.
The situation is unusual.
심상치 않아 is utilized here to express that the actions seem out of the ordinary or suspicious.
그의 행동은 심상치 않아 보여요.
His actions seem unusual.
심상치 않아 emphasizes an ominous feeling towards the change in wind patterns.