adj. 25B6; adjective
an elementary astronomy course : BASIC, rudimentary, fundamental; preparatory, introductory, initiatory.
a lot of the work is elementary : EASY, simple, straightforward, uncomplicated, undemanding, painless, child's play, plain sailing; informal as easy as falling off a log, as easy as pie, as easy as ABC, a piece of cake, no sweat, kids' stuff; Brit. informal easy-peasy.
advanced, difficult.