Grave, unsmiling (7)
I believe the answer is:
austere
(Other definitions for austere that I've seen before include "Without luxury or ornament" , "Severe in appearance" , "Abstemious and grave" , "Bleak" , "'Spartan, simple (7)'" .)
I believe the answer is:
austere
(Other definitions for austere that I've seen before include "Without luxury or ornament" , "Severe in appearance" , "Abstemious and grave" , "Bleak" , "'Spartan, simple (7)'" .)