supersimple
simplistic
simplish
easyish
easy peasy
ultrasimple
forthright
plain sailing
austere
stern
stark
severe
onefold
basical
uncomplicated
mick
nimps
eathy
downhill
easy as 123
easy as ABC
easy as pie
simple as kiss your hand
piss-easy
pimpsy
easy as falling off a log
dizzy
puddysticks
straightforward
incomplex
monoplex
uniplex
like a bowl in a china shop
cut and dried
easy peasy lemon squeezy
open-and-shut
unelaborate
uncryptic
nonsimple
unsimple
detailless
unstuffy
friendly
supereasy
eath
unembroidered
dumbed-down
simple
elementary
unproblematic