Is there any reason to judge "ヤバい" as a proper noun?

[ensan-hcl]

Hi! I'm always thankful to this project.
By the way when I parse "ヤバい", this word was judged as a proper noun. But it would be appropriate to be judged as an adjective. Is there any reason to judge as this?

input: ヤバい
ヤバい	名詞,固有名詞,一般,*,*,*,ヤバい,ヤバイ,ヤバイ

input: ヤバければ
ヤバ	名詞,一般,*,*,*,*,*
けれ	動詞,自立,*,*,五段・ラ行,仮定形,ける,ケレ,ケレ
ば	助詞,接続助詞,*,*,*,*,ば,バ,バ

[tfutada]

should be adjective as you said. this word is used both positive and negative way, meaning terrible or awesome. Mainly young people use in frank conversation with friends. Never used in formal situation like business.