verboten

adj

1. (emphatic, humorous, not-comparable, often)(Strictly) forbidden or prohibited.

   “Before that, students and professors could date whomever we wanted; the next day we were off-limits to one another—verboten, traife, dangerous (and perhaps, therefore, all the more alluring).”

   “Or was it because he [Mark Zuckerberg] has since been steeped in the relentless positivity of Silicon Valley, where it is verboten to imagine a bad outcome?”