IPA: /ˈsɒləmli/
KK: /ˈsɑːləmli/
In a serious and formal way, often used to show respect or importance.
The judge spoke solemnly as he announced the verdict.
Solemnly → It is formed from "solemn" (from Latin *solemnis*, meaning formal or ceremonial) and the adverbial suffix "-ly" (meaning in a manner of). The word "solemnly" means in a serious, formal, or ceremonial manner.
Think of the word 'solemn' which means serious or formal, and remember that 'solemnly' describes doing something in a serious way.