authentic (adj.)
- aboveboard
- absolute
- accepted
- accurate
- actual
- admissible
- approved
- authoritative
- avant-garde
- candid
- canonical
- cathedral
- certain
- circumstantial
- cognizable
- conclusive
- conventional
- convincing
- correct
- creative
- credible
- cumulative
- customary
- damning
- decisive
- dependable
- determinative
- documentary
- documented
- evangelical
- evidential
- evidentiary
- factual
- faithful
- final
- firm
- firsthand
- foursquare
- fresh
- genuine
- good
- hearsay
- historical
- honest
- imaginative
- implicit
- incontrovertible
- indicative
- indisputable
- indubitable
- irrefutable
- irresistible
- knowable
- lawful
- legitimate
- lifelike
- literal
- magisterial
- material
- natural
- naturalistic
- new
- novel
- official
- open
- original
- orthodox
- overwhelming
- positive
- presumptive
- probative
- proper
- pukka
- pure
- real
- realistic
- received
- recognizable
- reliable
- revolutionary
- right
- rightful
- scriptural
- significant
- simple
- sincere
- solid
- sound
- square
- standard
- sterling
- straight
- substantial
- suggestive
- sure
- sure-enough
- symptomatic
- telling
- textual
- traditional
- traditionalistic
- true
- true-blue
- trustworthy
- trusty
- unadulterated
- unaffected
- unalloyed
- unassuming
- uncolored
- undeniable
- underived
- undisguised
- undisputed
- undistorted
- unfeigned
- unflattering
- unimagined
- unique
- unpretending
- unqualified
- unquestionable
- unromantic
- unvarnished
- valid
- verbal
- verbatim
- veridical
- verisimilar
- veritable
- very
- weighty
'T is elder Scripture, writ by God's own hand,—
Scripture authentic! uncorrupt by man.
But as when an authentic watch is shown,
Each man winds up and rectifies his own,
So in our very judgments.