Simple

adjective, simpler, simplest.
1.
easy to understand, deal with, use, etc.:
a simple matter; simple tools.
2.
not elaborate or artificial; plain:
a simple style.
3.
not ornate or luxurious; unadorned:
a simple gown.
4.
unaffected; unassuming; modest:
a simple manner.
5.
not complicated:
a simple design.
6.
not complex or compound; single.
7.
occurring or considered alone; mere; bare:
the simple truth; a simple fact.
8.
free of deceit or guile; sincere; unconditional:
a frank, simple answer.
9.
common or ordinary:
a simple soldier.
10.
not grand or sophisticated; unpretentious:
a simple way of life.
11.
humble or lowly:
simple folk.
12.
inconsequential or rudimentary.
13.
unlearned; ignorant.
14.
lacking mental acuteness or sense:
a simple way of thinking.
15.
unsophisticated; naive; credulous.
16.
simpleminded.
17.
Chemistry.

composed of only one substance or element:
a simple substance.
not mixed.

18.
Botany. not divided into parts:
a simple leaf; a simple stem.
19.
Zoology. not compound:
a simple ascidian.
20.
Music. uncompounded or without overtones; single:
simple tone.
21.
Grammar. having only the head without modifying elements included: The simple subject of “The dappled pony gazed over the fence” is “pony.”.
Compare complete (def 5).
22.
(of a verb tense) consisting of a main verb with no auxiliaries, as takes (simple present) or stood (simple past) (opposed to compound).
23.
Mathematics. linear (def 7).
24.
Optics. (of a lens) having two optical surfaces only.
noun
25.
an ignorant, foolish, or gullible person.
26.
something simple, unmixed, or uncompounded.
27.
simples, Textiles. cords for controlling the warp threads in forming the shed on draw-looms.
28.
a person of humble origins; commoner.
29.
an herb or other plant used for medicinal purposes:
country simples.
adjective
1.
not involved or complicated; easy to understand or do: a simple problem
2.
plain; unadorned: a simple dress
3.
consisting of one element or part only; not combined or complex: a simple mechanism
4.
unaffected or unpretentious: although he became famous, he remained a simple and well-liked man
5.
not guileful; sincere; frank: her simple explanation was readily accepted
6.
of humble condition or rank: the peasant was of simple birth
7.
weak in intelligence; feeble-minded
8.
(prenominal) without additions or modifications; mere: the witness told the simple truth
9.
(prenomina) ordinary or straightforward: a simple case of mumps
10.
(chem) (of a substance or material) consisting of only one chemical compound rather than a mixture of compounds
11.
(maths)

(of a fraction) containing only integers
(of an equation) containing variables to the first power only; linear
(of a root of an equation) occurring only once; not multiple

12.
(biology)

not divided into parts: a simple leaf, a simple eye
formed from only one ovary: simple fruit

13.
(music) relating to or denoting a time where the number of beats per bar may be two, three, or four
noun (archaic)
14.
a simpleton; fool
15.
a plant, esp a herbaceous plant, having medicinal properties
simp

1. Early system on Datatron 200 series. Listed in CACM 2(5):16 (May 1959).
2. Simulation of Industrial Management Problems with Lots of Equations. R.K. Bennett, 1958. Predecessor to DYNAMO, for IBM 704.
see: pure and simple