Obscure, mysterious.
Understood by only a few.
Extremely old (e.g. interpretation or knowledge), and possibly irrelevant.
Requiring secret or mysterious knowledge to understand.
Open; frank.
Authentic; full.
Earned or acquired in a fair manner.
Accurate.
True, especially as far as is known by the person making the statement; fair; unbiased.
Scrupulous with regard to telling the truth; not given to swindling, lying, or fraud; upright.
In good faith; without malice.
Honestly; really.