primitive β being the first or earliest of the kind or in existence, especially in an early age of the world: primitive forms of life.
primo β the part of a piano duet played on the upper half of the keyboard.
simplest β easy to understand, deal with, use, etc.: a simple matter; simple tools.
simplex β simple; consisting of or characterized by a single element.
simplified β to make less complex or complicated; make plainer or easier: to simplify a problem.
substratal β something that is spread or laid under something else; a stratum or layer lying under another.
complex β Something that is complex has many different parts, and is therefore often difficult to understand.
basic β You use basic to describe things, activities, and principles that are very important or necessary, and on which others depend.
straightforward β going or directed straight ahead: a straightforward gaze.
uncomplicated β to make complex, intricate, involved, or difficult: His recovery from the operation was complicated by an allergic reaction.
plain β clear or distinct to the eye or ear: a plain trail to the river; to stand in plain view.
simple β easy to understand, deal with, use, etc.: a simple matter; simple tools.
fundamental β serving as, or being an essential part of, a foundation or basis; basic; underlying: fundamental principles; the fundamental structure.
rudimentary β pertaining to rudiments or first principles; elementary: a rudimentary knowledge of geometry.
easy β not hard or difficult; requiring no great labor or effort: a book that is easy to read; an easy victory.