Truly definition

(1) In accordance with truth or fact or reality

"She was now truly American"

"A genuinely open society"

"They don't really listen to us"

(2) In fact (used as intensifiers or sentence modifiers)

"In truth, moral decay hastened the decline of the Roman Empire"

"Really, you shouldn't have done it"

"A truly awful book"

(3) By right

"Baseball rightfully is the nation's pastime"

(4) With sincerity; without pretense

"She praised him sincerely for his victory"

"Was unfeignedly glad to see his old teacher"

"We are truly sorry for the inconvenience"