from good hands
have something on good authority
springhead
confirmatively
bankable
authority
trusted
unsupported
dead-on
probably
likely
in all likelihood
belike
in all probability
truth
reliably
right as rain
to a nicety
straight from the horse's mouth
honest
dead on
unerring
on target
reputably
copper-bottomed
precise
unmistaken
hyperaccurate
factful
unsuspect
safe
up to the knocker
intersource
speak by the card
verifiably
corroboratively
superaccurate
right
veracious
steady-handed
credibly
crisp
surgical
positively
correctly
provably
ultrareliable
plausible
correct
steady as a rock