1. genuinely, really, truly

in accordance with truth or fact or reality

Example Sentences:
'she was now truly American'
'a genuinely open society'
'they don't really listen to us'

• genuinely
• really

2. rightfully, truly

by right

Example Sentences:
'baseball rightfully is the nation's pastime'

• rightfully

3. sincerely, truly, unfeignedly

with sincerity; without pretense

Example Sentences:
'she praised him sincerely for his victory'
'was unfeignedly glad to see his old teacher'
'we are truly sorry for the inconvenience'

• sincerely
• unfeignedly

4. in truth, really, truly

in fact (used as intensifiers or sentence modifiers)

Example Sentences:
'in truth, moral decay hastened the decline of the Roman Empire'
'really, you shouldn't have done it'
'a truly awful book'

• in truth
• really