solemnly
adv. manner B2 Upper Intermediate US //ˈsɔɫəmɫi// UK //sˈɒləmli// solemn·ly
adv. in a very serious and formal way. You use this when someone is not joking and wants to show they are being sincere.
adv. in a formal and dignified manner; with deep sincerity or gravity.
He promised solemnly to tell the truth.
The witnesses stood and solemnly swore to uphold the law during the ceremony.
The judge looked at the defendant and spoke solemnly about the consequences of his actions before delivering the final sentence.
From solemn + -ly.
Usage
Manner adverb — typically follows the verb it modifies or sits at the end of the clause.