Serious in demeanor (5)
I believe the answer is:
stern
(Other definitions for stern that I've seen before include "Severe -- back of boat" , "Severe; grimly serious" , "Strict, austere" , "Unsmiling" , "Ship's rear" .)
I believe the answer is:
stern
(Other definitions for stern that I've seen before include "Severe -- back of boat" , "Severe; grimly serious" , "Strict, austere" , "Unsmiling" , "Ship's rear" .)