(s)elementary, simple, uncomplicated, unproblematiceasy and not involved or complicated“an elementary problem in statistics”, “elementary, my dear Watson”, “a simple game”, “found an uncomplicated solution to the problem”
(s)bare, mere, simpleapart from anything else; without additions or modifications“only the bare facts”, “shocked by the mere idea”, “the simple passage of time was enough”, “the simple truth”