Unable to transmit light (6)
I believe the answer is:
opaque
(Other definitions for opaque that I've seen before include "Not transmitting or reflecting light" , "Mysterious" , "Unintelligible" , "Not clearly expressed" , "Non-translucent" .)
I believe the answer is:
opaque
(Other definitions for opaque that I've seen before include "Not transmitting or reflecting light" , "Mysterious" , "Unintelligible" , "Not clearly expressed" , "Non-translucent" .)