Adjective simple has 7 senses
  1. simple - having few parts; not complex or complicated or involved; "a simple problem"; "simple mechanisms"; "a simple design"; "a simple substance"
    complex, analyzable, decomposable, Byzantine, convoluted, intricate, involved, knotty, tangled, tortuous, colonial, complicated, composite, compound, daedal, Gordian, interlacing, interlinking, interlocking, interwoven, labyrinthine, labyrinthian, mazy, multifactorial, multiplex, thickening
  2. elementary, simple, uncomplicated, unproblematic - easy and not involved or complicated; "an elementary problem in statistics"; "elementary, my dear Watson"; "a simple game"; "found an uncomplicated solution to the problem"
    Antonyms: difficult, hard (indirect, via easy)
  3. bare, mere, simple - apart 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"
    Antonym: fancy (indirect, via plain)
  4. childlike, wide-eyed, dewy-eyed, simple - exhibiting childlike simplicity and credulity; "childlike trust"; "dewy-eyed innocence"; "simple courtesy"
    Antonym: sophisticated (indirect, via naive)
  5. dim-witted, half-witted, simple, simple-minded - lacking mental capacity and devoid of subtlety
    Antonym: precocious (indirect, via retarded)
  6. simple, unsubdivided - (botany) of leaf shapes; of leaves having no divisions or subdivisions
    Antonyms: compound, bilobate, bilobated, bilobed, binate, bipinnate, cleft, dissected, conjugate, decompound, even-pinnate, abruptly-pinnate, paripinnate, incised, lobed, lobate, odd-pinnate, imparipinnate, parted, palmate, palm-shaped, pedate, pinnate, pinnated, pinnatifid, pinnatisect, quinquefoliate, ternate, trifoliate, trifoliolate, trifoliated, trilobate, trilobated, trilobed, bipartite, bipinnatifid, palmatifid, tripinnate, tripinnated, tripinnatifid
  7. simple - not elaborate in style; unornamented; "a simple country schoolhouse"; "her black dress--simple to austerity"
    fancy (indirect, via plain)
,Noun simple has 2 senses
  1. simple - any herbaceous plant having medicinal properties
    --1 is a kind of
    herb, herbaceous plant
  2. simpleton, simple - a person lacking intelligence or common sense
    --2 is a kind of person, individual, someone, somebody, mortal, human, soul
    --2 has particulars:
     airhead; dimwit, nitwit, half-wit, doofus; dingbat; dumbbell, dummy, dope, boob, booby, pinhead; dunce, dunderhead, numskull, blockhead, bonehead, lunkhead, hammerhead, knucklehead, loggerhead, muttonhead, shithead, fuckhead; fool, sap, saphead, muggins, tomfool; idiot, imbecile, cretin, moron, changeling, half-wit, retard; idiot savant; nebbish, nebbech; nincompoop, poop, ninny; scatterbrain, forgetful person; schlemiel, shlemiel; schnook, shnook; sheep; space cadet; square, lame; stupid, stupid person, dullard, dolt, pudding head, pudden-head, poor fish, pillock; subnormal; twerp, twirp, twit