서늘해요 · 서늘했어요 · 서늘한 (+noun)
cool, chilly; chilling (with fear)
Example
가을이 되니 아침저녁으로 바람이 서늘해졌어요.
Now that it's fall, the wind has turned cool in the mornings and evenings.
Word parts
A softer cousin of 싸늘하다 'icy cold'; compare 선선하다 'pleasantly cool'.
Good to know
Figurative: 등골이 서늘하다 'a chill runs down my spine' from fear.