easy to understand, deal with, use, etc.

a simple matter; simple tools.

not elaborate or artificial; plain

a simple style.

not ornate or luxurious; unadorned

a simple gown.

unaffected; unassuming; modest

a simple manner.

not complicated

a simple design.

not complex or compound; single.

occurring or considered alone; mere; bare

the simple truth; a simple fact.

free of deceit or guile; sincere; unconditional

a frank, simple answer.

common or ordinary

a simple soldier.

not grand or sophisticated; unpretentious

a simple way of life.

humble or lowly

simple folk.

inconsequential or rudimentary.

unlearned; ignorant.

lacking mental acuteness or sense

a simple way of thinking.

unsophisticated; naive; credulous.

simpleminded.

Chemistry .

composed of only one substance or element

a simple substance.

not mixed.

Botany . not divided into parts

a simple leaf; a simple stem.

Zoology . not compound

a simple ascidian.

Music . uncompounded or without overtones; single

simple tone.

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

(of a verb tense) consisting of a main verb with no auxiliaries, as takes (simple present) or stood (simple past) ( opposed to compound ).

Mathematics . linear ( def. 7 ) .

Optics . (of a lens) having two optical surfaces only.

an ignorant, foolish, or gullible person.

something simple, unmixed, or uncompounded.

simples, Textiles . cords for controlling the warp threads in forming the shed on draw-looms.

a person of humble origins; commoner.

an herb or other plant used for medicinal purposes

country simples.

noun

plainness , simplicity , unassumingness , unostentatiousness , unpretentiousness