There are no perfect rhymes for the word solemnly.
Solemnly is an adverb.
She solemnly sat and ate her supper.
i solemnly swear to tell the truth and nothing but the truth
She solemnly stared out the window as she sat deep in thought about her past.
serious, intense, holy, divine
She solemnly sat on her bed and cried until she finally fell asleep.
Jokingly.
excitedly
Solemnly.
And I hereby solemnly declare that all those allow competitions in these sector are courageous persons.
The silent letter in "solemnly" is the "n". It is pronounced as "solem-ly" with the "n" being silent.
If a person is opposed to swearing an oath, they can make a solemn affirmation. Instead of saying "I hereby swear to...", they would simply say "I do solemnly affirm..."