truthful (adj.)

• accurate
• actual
• ascertained
• attested
• authenticated
• candid
• certain
• certified
• confirmed
• corroborated
• demonstrated
• determined
• documentary
• earnest
• effectual
• established
• factual
• faithful
• forthright
• frank
• historical
• honest
• proved
• real
• realistic
• reliable
• sincere
• straightforward
• substantiated
• sure-enough
• true
• trustworthy
• unembellished
• unquestionable
• unvarnished
• validated
• veracious
• veridical
• verified
• veritable