Simple

Synonyms for simple
adj clear, understandable; easy

straightforward
plain
smooth
quiet
transparent
clean
elementary
uncomplicated

snap
light
picnic
cinch
walkover
easy as pie
effortless
facile

intelligible
lucid
manageable
mild
piece of cake
self-explanatory
uninvolved
unmistakable

incomplex
no problem
no sweat
not difficult
simple as ABC
untroublesome
child’s play

Antonyms for simple

complicated
intricate
unclear
vague
abstruse
convoluted
exacting
unintelligible

cluttered
jumbled
ornate
mature
older
aware
intelligent
difficult

hard
involved
complex
decorated
embellished
sophisticated
smart
on-the-ball

Synonyms
adj uncluttered, natural

pure
classic
plain
modest
clean
elementary
uncomplicated
vanilla
mere
rustic
single

spartan
absolute
austere
discreet
folksy
homely
homey
humble
lowly
sheer
unadorned

unadulterated
unaffected
unembellished
unmitigated
unpretentious
unqualified
unblended
unostentatious
inelaborate
not complex
open and shut

pure and simple
unalloyed
uncombined
uncompounded
undecorated
unelaborate
unfussy
unmixed
unornamented

Antonyms

impure
immodest
unchaste
indefinite
abnormal
complicated
intricate
abstruse
extraordinary
convoluted

exacting
unclear
unintelligible
cluttered
jumbled
ornate
mature
older
aware
intelligent

dirty
polluted
complex
difficult
decorated
embellished
sophisticated
smart
on-the-ball

Synonyms
adj childlike, innocent

plain
honest
natural
direct
basic
amateur
frank

square
green
artless
bald
childish
guileless
ingenuous

naive
naked
sincere
stark
trusting
unaffected
undeniable

unpretentious
unschooled
unsophisticated
unstudied
unvarnished
unartificial
unexperienced

Antonyms

abnormal
dishonest
complicated
convoluted
exacting
intricate
unclear
unintelligible

cluttered
jumbled
ornate
mature
older
aware
intelligent
uncommon

devious
complex
difficult
decorated
embellished
sophisticated
smart
on-the-ball

Synonyms
adj feeble-minded; not intelligent

stupid
silly
illiterate
amateur
shallow
imbecile
fat
green
thick
asinine

backward
brainless
credulous
dense
dull
dumb
feeble
foolish
gullible
half-witted

idiotic
ignorant
inane
inexperienced
inexpert
insensate
mindless
moronic
obtuse
senseless

slow
soft
uneducated
unintelligent
witless
dimwitted
simple-minded
nitwitted
soft-headed

Antonyms

intelligent
complicated
convoluted
exacting
intricate
unclear
unintelligible
cluttered

jumbled
ornate
mature
older
aware
smart
slight
thin

complex
difficult
decorated
embellished
sophisticated
on-the-ball