forthright
simplistic
simplish
ultrasimple
easy peasy
supersimple
dizzy
haplo-
there's nothing to it
purely and simply
onefold
stern
austere
stark
severe
nothing to it
uncomplication
decomplication
dumbed-down
easyish
loon
maffling
woodcock
doof
rondoletto
uncomplicated
plain sailing
simpleness
plaintively
eathy
downhill
mick
nimps
simple as kiss your hand
easy as pie
piss-easy
straightforward
easy as falling off a log
pimpsy
stock
in front of one's nose
plain as Dunstable highway
smooth
cake walk
uncryptic
cut and dried
open-and-shut
spell things out
broad
plainful
monoplex
plainly
patent
uniplex
nontaxing
mawkin
waltz
clear cut
child's play
straightforwardly
lor
unembroidered
au naturel
spell out
bludge
doss
basicity
basic
sell
plat
flatling
minimality
basical
easy peasy lemon squeezy
simplex
subtly
inexpensively
decidedly
briefly
supersimplification
straight from the shoulder
easy as ABC
easy as 123
unembellished
easy
leastwise
fairly
plain
manifestly
evidently
obviously
make head or tail of
simples
patently
apparently
easify