English definition of “simple”
EASY › not difficult to do or to understand: [+ to do sth] It's very simple to use. Just mix all the ingredients together - it's as simple as that.
NOT COMPLICATED › not complicated or containing details which are not necessary: a simple life a simple black dress (= dress without decoration)
IMPORTANT › used to describe the one important fact, truth, etc: We chose her for the simple reason that she's the best person for the job.