ascertained (adj.)

• actual
• appreciated
• apprehended
• assured
• attested
• authenticated
• certain
• certified
• comprehended
• conceived
• confirmed
• corroborated
• decided
• demonstrated
• determinate
• determined
• documentary
• effectual
• established
• factual
• fixed
• grasped
• guaranteed
• historical
• known
• open-and-shut
• pat
• perceived
• prehended
• proved
• proven
• real
• realized
• recognized
• secure
• set
• settled
• stated
• substantiated
• sure-enough
• tested
• tried
• true
• truthful
• understood
• unquestionable
• validated
• veracious
• verified
• veritable
• warranted