Example : She was now truly American.
A genuinely open society.
They don't really listen to us.

Synonyms : genuinely, really

Example : Baseball rightfully is the nation's pastime.

Synonyms : rightfully

Example : She praised him sincerely for his victory.
Was unfeignedly glad to see his old teacher.
We are truly sorry for the inconvenience.

Synonyms : sincerely, unfeignedly

Example : In truth, moral decay hastened the decline of the Roman Empire.
Really, you shouldn't have done it.
A truly awful book.

Synonyms : in truth, really