From the bottom of one's heart , earnestly, and fervently are synonyms for sincerely; insincerely and deceitfully are antonyms of sincerely. On this page, you will find 16 another word for sincerely.
I sincerely appreciate your kind help.
She sincerely apologized for the misunderstanding.
He spoke sincerely about his feelings.
Sincerely yours, I remain hopeful.