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