Louche was used in a biography I'm reading, and I checked it out in the dictionary. What I found interesting was how the definition went in a couple of closely-related directions, but the etymology did, too. I'll copy out what I found in AHD:

louche: of questionable taste or morality; decadent... [French, from Old French losche, squint-eyed, feminine of lois, from Latin luscus, blind in one eye.

Ironic to consider With Eyes Wide Open and how, way back when, decadence was related (perhaps) to blinding one eye.

Book regards,
Wordwind Wanna guess whose biography this one is? Wide-eyed open field, huh?!