cut and dried
plain sailing
uncomplicated
nothing to it
clear cut
onefold
straightforward
smooth
unpretended
plain as Dunstable highway
easy peasy
child's play
purely and simply
spell out
uncryptic
open-and-shut
ingenuousness
simplex
straightforwardly
uncryptically
spell things out
prosaically
explicit
au naturel
simplistic
basic
directly
straight from the shoulder
nontaxing
forthright
squarely
when it's at home
basical
detailless
plaintively
simplish
spell it out
loud and clear
gain
ultrasimple
supersimple
decomplication
uncomplication
canonical
unembroidered
unelaborate
chaste
there's nothing to it
eath
stock