Synonyms for Simple:

adj.

absolute (adjective)
entire.
childlike, innocent (adjective)
artless, unvarnished, basic, unstudied, unsophisticated, honest, frank, stark, direct, natural, bald.
clean (adjective)
uncluttered.
daft (adjective)
idiotic.
dense (adjective)
slow-witted.
earthy (adjective)
folksy.
economical (adjective)
spartan.
feeble-minded; not intelligent (adjective)
mindless, idiotic, inane, illiterate, unintelligent, foolish, half-witted, ignorant, backward, soft, uneducated, dull, silly, slow, imbecile, shallow, brainless.
feebleminded (adjective)
Weak-minded.
foolish (adjective)
tomfool.
ignorant (adjective)
uneducated, empty-headed, uninformed, unintelligent, mindless, brainless, foolish, unlearned, ignorant, illiterate.
mere (adjective)
unmixed.
modest (adjective)
unostentatious.
perfect (adjective)
unalloyed, perfect.
pure (adjective)
purebred, primary, faultless, guiltless, elemental, blameless, immaculate, sinless, stainless, spotless, stark, nascent, atomic, unsullied, aboriginal, clean, foundational, untainted, decent, unadorned, chaste, white, honorable, undefiled, primal, monolithic, basic, plain, untarnished, pure, essential, unadulterated, elementary, Simon-pure, undiluted, innocent, prime, austere, clear, formative, unblemished, virtuous, fundamental, unalloyed, angelic, irreducible, basal, indivisible, uncluttered, bare.
shallow (adjective)
shallow.
single (adjective)
unblended.
succinct (adjective)
unpoetical, folksy, frank, direct, straightforward, informal, ordinary, Plain-spoken, blunt, unpretentious, casual, uncluttered, prosaic, bald, honest, stark, unadorned, intelligible, candid, clear, outspoken.
uncluttered, natural (adjective)
lowly, homely, unalloyed, humble, folksy, sheer, unadorned, unadulterated, unostentatious, unblended, modest, unpretentious, spartan, unmixed, absolute, austere, unaffected, pure, single.
united (adjective)
unified, holistic, congruous, cohesive, pure, intact, integral, uniform, same, integrated, irreducible, united, single, homogeneous, solid, atomic, complete, elemental, undivided, coincident, indivisible, coherent, congruent, fundamental, entire, monolithic.

adv.

lowly (adverb)
modest.

n.

unblended, common, uneven, unmixed, simplistic, collective, corporate, Among, distributed, personal. routine, sheer, absolute, unexceptional, mundane, nondescript, everyday, commonplace, unremarkable, perfect, normal, standard. snap, irreproachable, upstanding, good, principled, fine. dry, unvarnished, idiotic, silly. modest, unassuming, apparent, evident, manifest, unostentatious, clear-cut, understandable, make sense. half-witted, come naturally/easily/easy (to someone), slow, Feeble-minded, trouble-free, Weak-minded, ability, undemanding, soft, convenient, backward, slow-witted, dull. no reason, perish the thought, humble, mean, it's a long story, don't remind me, lowly, skip it, don't ask. ninny, goose, goof, ding-dong, moron, turkey, cretin, gander, nitwit, nerd, tomfool, schmo, fool, nincompoop, imbecile, softhead, schmuck, Mooncalf, jerk, dip. easy (noun)
manageable, puzzling, mild, obscure.
fool (noun)
turkey, softhead, schmo, Mooncalf, ninny.
plain (noun)
modest, unaffected, homely.
schmuck (noun)
schmuck.
stupid (noun)
inane, shallow, dull.
undecorated (noun)
functional, spartan, plainly, simply.

Other synonyms:

Among. unworldly. personal. slow, backward. perfect. dry. commonplace
common.
easy
soft.
genuine
unaffected.
meek
humble.
plain
unvarnished.
undecorated
plainly, spartan, functional.
unpretentious
homely.

Usage examples for simple

  1. " Not that simple Chahda said. – The Golden Skull by John Blaine
  2. They smiled at each other as though to say, " A simple fellow, isn't he?" – Men Called Him Master by Elwyn Allen Smith
  3. Henry's work was simple enough. – The Emancipation of Massachusetts by Brooks Adams