ingenuous
upfront
candid
on the square
unsecretive
up front
level with
plain
forthright
squarely
play it straight
square
ingenuousness
keep it a buck
direct
open-hearted
ridgy-didge
honest
man-to-man
open-faced
overt
single-hearted
dinkum
openly
like a martin to his gourd
straight talk
evendown
candor
on the up-and-up
frankly
honestly
wear one's heart on one's sleeve
straight dinkum
straight arrow
straight shooter
freedom
bluffness
square shooter
make no secret of
fair dinkum
plain-spoken
unscheming
dinky-di
honest injun
clear cut
undissimulated
level
open-mindedly
frankheartedness
hearts on sleeves