Louche:
If you describe a person or place as louche, you mean that they are unconventional and not respectable, but often in a way that people find rather attractive. [Collins Dictionary]
Noted in “Consciously quantum: How you make everything real,” Philip Ball, NewScientist (11 November 2017, paywall):
The idea that consciousness induces wave function collapse, the process by which myriad possible outcomes of a measurement become a single definite one, is not inherently absurd. And yet physicists have long regarded it as a rather louche suggestion, because it seems to substitute one mystery for another: we have no idea how to describe consciousness, so how can we expect to know how it causes collapse?
