i Register
In some senses, felicitate is marked as archaic. Watch for register when choosing this word.
verb
To congratulate.
[…]we contemplate death under quite a different aspect;—creating in us such sweet influences of joy, that our beloved brethren, under one common Father, have attained what we ought all to be in search of, the heavenly goal, that rather than repine at this their advancement, we sincerely felicitate them.
[…] he waddled to the platform, bowed as low as his belly would permit, and was duly decorated and felicitated […]
adj
Made very happy.
I am alone felicitate / In your dear highness' love.