(adjective) Something being both beautiful (pleasurable) and horrific at the same time [1].
The idea of a “glass lawn”, as an example, has a wonderfully menacing allure:

DALLE Prompt: Please show me a rendering of a large, New England mansion with a few landscaping features, as seen from the front of the house. Perspective is fixed on the front door of the house and looks over a walkway of winding stepping stones through the lawn to the front porch. The grass (made of glass) in the yard is overgrown to waist height and crowds the stepping stones. The house itself is immaculate. EVERYTHING in the scene is made of glass and exhibits only subtle hues of its typical colors — shimmering glass through a morning sunrise is the dominant visual feature. The scene conjures a sense of luxury and hospitality with a cruel, punishing detachment exhibited by the dangers awaiting those that deviate from expectation or design. Contact with the grass or any other flora could be lethal.
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