Connoting physical beauty and danger:
* Alluring: Suggests a captivating, irresistible charm that can be hazardous.
* Enticing: Implies a tempting, but potentially risky appeal.
* Luminous: Can describe something radiant and beautiful but also potentially blinding.
* Dazzling: Similar to luminous, but emphasizes a brilliance that might distract or overwhelm.
Connoting abstract beauty and danger:
* Captivating: Can describe something fascinating and compelling, even if it's ultimately harmful.
* Mesmerizing: Suggests a beauty that is so powerful it can be overwhelming and even dangerous.
* Treacherous: Highlights the hidden danger within something seemingly beautiful.
* Deceitful: Implies a deceptive beauty that masks a harmful nature.
More metaphorical and poetic options:
* Siren: Refers to mythical creatures whose beauty lured sailors to their deaths.
* Pandora's Box: Symbol of a beautiful but ultimately dangerous temptation.
* Forbidden fruit: A classic image of something beautiful but dangerous to partake in.
The best word for you will depend on the context and the specific kind of beauty and danger you want to express.