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