Simple

Synonyms Straightforward, uncomplicated, effortless, manageable, unexacting, child's play, a five-finger exercise, as easy as falling off a log, as easy as ABC, a cinch, easy-peasy, a doddle, money for old rope, kids' stuff, a doss, duck soup, a bludge, a piece of old tackle, plain, intelligible, understandable, lucid, unambiguous, accessible, easy, uninvolved, painless, undemanding, elementary, plain sailing, nothing, as easy as pie, a piece of cake, a snip, no sweat, a pushover, money for jam, a breeze, a cakewalk, a snap, a snack, clear, clearly expressed, comprehensible, (words) of one syllable, coherent, direct, and user-friendly.

Synonyms Basic, mere, pure, candid, honest, sincere, absolute, bald, naked, unadorned, unembellished, fundamental, sheer, pure and simple, frank, direct, plain, unqualified, stark, blunt, and unvarnished.

Synonyms Plain, undecorated, unornamented, unelaborate, unostentatious, no-nonsense, modest, penny plain, honest, homespun, workaday, severe, austere, spare, muted, patternless, understated, clean, homestyle, unadorned, unembellished, without ornament/ornamentation, unpretentious, unfussy, basic, unsophisticated, without frills, homely, everyday, stark, spartan, chaste, bare, unpatterned, classic, uncluttered, restrained, and no-frills.

Synonyms Unpretentious, ordinary, unassuming, honest-to-goodness, homely, humble, lowly, innocent, guileless, naive, gullible, cracker-barrel, unsophisticated, unaffected, natural, modest, wholesome, quiet, rustic, artless, childlike, ingenuous, inexperienced, and green.

Synonyms Non-compound, uncompounded, unmixed, unalloyed, basic, elementary, non-complex, uncombined, unblended, pure, single, and fundamental.