Grave in manner (6)
I believe the answer is:
solemn
(Other definitions for solemn that I've seen before include "gloomy" , "Serious, dignified or ceremonial" , "Formal, dignified" , "Portentous" , "Marked by pomp, cermony or formality" .)
I believe the answer is:
solemn
(Other definitions for solemn that I've seen before include "gloomy" , "Serious, dignified or ceremonial" , "Formal, dignified" , "Portentous" , "Marked by pomp, cermony or formality" .)