streamlined
egg of Columbus
smooth
easify
purely and simply
stock
straightforward
straightforwardly
clear cut
nothing to it
supersimple
plain as Dunstable highway
unconcerned
there's nothing to it
directly
breathe freely
unquibbled
pave
onefold
plain sailing
simplemindedly
easened
candid
supersimplification
heart-to-heart
bada bing bada boom
porrectly
open
chaste
open-and-shut
like taking candy from a baby
straightish
simplify
forthright
easyish
easy peasy
simplistic
smoothen
smooth out
lead-pipe cinch
snug
open-hearted
besmooth
uncomplicated
straight from the shoulder
cut and dried
nimps
cake walk
downhill
squarely