凄い[sugoi] terrible
凄む[sugomu] to threaten
凄艶[seien] weirdly beautiful
凄惨[seisan] ghastly
凄文句[sugomonku] intimidating language

凄味[sugomi] weirdness
凄腕[sugoude] go-getter
物凄い[monosugoi] earth-shattering
凄じい[susamajii] terrific
凄絶[seizetsu] extremely