凄 means “tremendous, eerie”

すごい · sugoi

Also: uncanny, weird, threatening, horrible

Kun'yomi (Japanese reading)
さむい, すごい, すさまじい
On'yomi (Chinese reading)
セイ, サイ

JLPT N1 · Taught in secondary school · 10 strokes

The story

Ice (冫) creeping in beside 妻: picture a sudden chill that raises goosebumps. 凄 is the eerie and the overwhelming: 凄惨 is gruesome, 凄まじい ferocious, and 凄い, usually written すごい, once meant chilling before it meant amazing.

Used in 凄い (sugoi, amazing/terrible), 凄まじい (susamajii, tremendous/fierce), and 凄惨 (seisan, gruesome)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.