One way to hold this word: someone or something that has out of the line everyone else is walking in. It is not simply bad. It is loose — away from the group, away from whatever was keeping it in order. Once it is out there, nobody can say what it will do next, and that is where both the danger and the charm come from.
From the word’s history
The source marks the origin as uncertain and lists several possible routes, including an earlier English roger (a wandering beggar who pretended to be a poor scholar) and a Middle French rogue meaning haughty. Each of those pictures a person living outside the ordinary order, which is the same idea the modern word still carries.
來源沒有定論。資料列了幾條可能：早期英文的 roger，指假裝成窮學生四處乞討的流浪者；中古法文的 rogue，意思是傲慢；也有人提到凱爾特語。無論走哪一條，指向的都是「活在正規秩序之外的人」，這正好對得上今天 rogue 的核心感覺。這裡只是說線索一致，不是說現代意思由某一條直接生出來。
Wiktionary entry for rogue, supplied in this packet (kaikki:3f6f69a190036ae4:425039685); the entry itself marks the origin as uncertain.
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