solemn

1 ENTRIES FOUND:
solemn /ˈsɑːləm/ adjective
solemn
/ˈsɑːləm/
adjective
Britannica Dictionary definition of SOLEMN
1 
: very serious or formal in manner, behavior, or expression
2 
: sad and serious
3 
: done or made sincerely

— solemnly

adverb