windowless

adj

1. (not-comparable)Having no windows, especially no external windows.

   “Billionaire Charlie Munger’s controversial plans for a massive, windowless dorm at the University of California, Santa Barbara has left many wondering – how is this even possible?”

   “"There are windowless seats / wheelchair spaces at each end of the coach where the (exterior) sliding door slides between the exterior skin and the interior trim. [...] "My photo is in coach G, the Standard buffet coach, where there's an even longer windowless section."”