What are the antonyms for SERIOUS?

deceptive, balmy, beneficial, calm, unthreatening, false, daft, noncritical, dishonest, dotty, noncrucial, safe, unserious, frivolous, worthless, jesting, unwise, nonhazardous, nonsensical, mad, cuckoo, trivial, kooky, untrustworthy, senseless, brainless, easy, Weak-minded, Daffy, small, harmless, happy, innocent, insane, flippant, nonintellectual, loony, lunatic, innocuous, insincere, advantageous, meaningless, funny, witless, zany, little, good, uproarious, nutty, misleading, screwball, insignificant, lite, hilarious, fatuous, foolish, wacky, jerky, facile, half-witted, crazy, asinine, friendly, joking, sappy, light, minor, cockeyed, unimportant.

Synonyms for SERIOUS

determined,
supreme,
onerous,
demure,
menacing,
heavy,
earth-shattering,
Jeopardous,
world-shaking,
out of time,
Operose,
composed,
sober,
incurable,
formidable,
hermetic,
uneasy,
go with,
sure enough,
urgent,
heart and soul,
extravagant,
material,
valiant,
dauntless,
valuable,
Dead level,
touch and go,
meaningful,
sincere,
unshakeable,
nerve-wracking,
extensive,
solid,
life-threatening,
disciplined,
resolved,
foreboding,
gross,
applicative,
concerned,
meditative,
upfront,
momentous,
distressing,
worrisome,
most reverend,
unsmiling,
cohabit,
have one's act together,
date,
fatal,
submerged,
high-power,
hearty,
no joke,
philosophic,
sobersided,
uphill,
active,
austere,
cardinal,
willing,
decided,
persevering,
major-league,
harmful,
inoperable,
massive,
grim,
unsentimental,
wholehearted,
troubled,
arduous,
mere,
monumental,
no-nonsense,
of consequence,
severely,
high-powered,
of note,
humorless,
fraught,
heat-on,
up-front,
sacrosanct,
spectacular,
earthshattering,
Disimpassioned,
sibylline,
earthshaking,
intent,
whole-hearted,
critical,
hellbent,
unassured,
bad,
ad rem,
rigorous,
downbeat,
hard-as-nails,
strong-minded,
pre-eminent,
dangerous,
go together,
playing hard ball,
Undissembled,
heart-rending,
big-deal,
sharply,
focal,
big-name,
pokerfaced,
fervid,
Heightened,
stolid,
unbearable,
enormous,
nobody home,
grievous,
all-important,
far-reaching,
great,
diligent,
nasty,
life and death,
dangersome,
engaged,
distinguished,
extreme,
headstrong,
big league,
loyal,
set on,
dally with,
fell,
dignified,
unsparing,
all-consuming,
extra ordinary,
hotblooded,
sedate,
four-star,
pensive,
sublime,
forgoing,
twenty-four carat,
laid back,
nervous,
draconian,
well-ordered,
anxious,
ironhanded,
nubile,
in the process of doing something,
thoughtful,
lighten up,
disquieting,
ominous,
big,
relentless,
of vital importance,
meaning business,
intense,
contemplative,
vitally important,
deadpan,
seriously,
sobering,
staunch,
out for blood,
towering,
fervent,
mature,
officious,
down in mouth,
developed,
crushing,
funereal,
mattering much,
matriarchal,
hurry-up,
vital,
true,
weighty,
blue chip,
signal,
head ache,
hell-bent,
laborious,
fool around,
important,
straight-faced,
bigtime,
bound and determined,
tireless,
something else,
considerable,
strong,
sacred,
vitally,
notable,
epoch-making,
dreadfully,
deliberate,
in a brown study,
genuine,
consequential,
Immedicable,
hard to understand,
Rememberable,
goodly,
work,
on up and up,
life-and-death,
steadfast,
grave,
unamusing,
stubborn,
top-priority,
wisest,
pivotal,
high,
no laughing matter,
make-or-break,
implacable,
huge,
fearless,
Clear-headed,
flinty,
badly,
long-faced,
special,
Remediless,
poker-faced,
well-built,
effortful,
the end,
front-page,
top drawer,
major league,
Toilful,
big-wig,
eternal,
fateful,
workaday,
crucial,
importunate,
heart-and-soul,
keeping one's shirt on,
damaging,
threatening,
unwavering,
major,
high-priority,
set,
unrecoverable,
zealous,
Celebrious,
hard as nails,
unsettled,
iron-handed,
prominent,
life or death,
uphill battle,
reasonable,
venerable,
cool as cucumber,
inexorable,
much,
bullheaded,
law-abiding,
irrecoverable,
historic,
bound,
bold,
proper,
merciless,
cold sober,
savage,
keen,
high-level,
spunky,
heavyweight,
te,
lost in thought,
devoted,
coldblooded,
strictly business,
earnest,
stiff,
of great consequence,
faithful,
constant,
on line,
fundamental,
disconcerting,
ferocious,
keeping a stiff upper lip,
super colossal,
strenuous,
disturbing,
out-standing,
alarmist,
acute,
persistent,
reliable,
sure of oneself,
unbending,
dire,
abstinent,
earth-shaking,
dying to,
frightening,
humorlessly,
businesslike,
never-failing,
high-profile,
niggling,
low key,
matter of fact,
hot,
court,
stellar,
significant,
indomitable,
unexcited,
virile,
courageous,
central,
risky,
unimpassioned,
dogged,
ruinous,
unyielding,
of moment,
front page,
dearly,
worried,
reflective,
in brown study,
Museful,
daunting,
ruthless,
dominant,
brooding,
hardboiled,
pretensionless,
cheat,
unflinching,
terrible,
go for broke,
carrying a lot of weight,
devout,
Exceptive,
Soothed,
iron-willed,
scalding,
dirgelike,
falling all over oneself,
widely,
singleminded,
rigid,
of substance,
unassertive,
orphic,
injurious,
staid,
telling,
subdued,
committed,
substantial,
decisive,
involved,
studious,
distingue,
of age,
unchangeable,
out and out,
landmark,
terminal,
overtaxing,
attitude,
hard,
hard-working,
upset,
no nonsense,
go great guns,
profound,
nowhere to go,
frightened,
keenly,
fatally,
not turn a hair,
suspicious,
resolute,
hardnosed,
sore,
help,
far,
Acroamatic,
Nail Biting,
solemn,
tense,
especial,
patriarchal,
Difficile,
on the line,
steady,
gotta have,
took the pledge,
newsworthy,
stand-out,
dead-level,
stern,
uncorrectable,
intent upon,
carry on,
desperate,
pressing,
large,
full-grown,
smoking,
salient,
firm,
front and center,
awful,
unhumorous,
disastrous,
out of spirits,
ruminative,
nonindulgent,
sickening,
bodacious,
explosive,
dead set on,
shaky,
well-informed,
on edge,
levelheaded,
portentous,
plucky,
ugly,
Searing,
worrying,
unidealistic,
tenacious,
deep,
oppressive,
splasher,
classical,
indefatigable,
difficult,
thorough,
no fooling,
hopped up,
steely,
key,
tall,
severe,
ultimate,
not drunk,
stressful,
noteworthy,
uncompromising,
insistent,
depressive,
dedicated,
on collision course,
tough,
complicit,
actively,
be harnessed to,
alarmed,
painful,
pointful,
go out,
eminent,
at ease,
parlous,
strong-willed,
heavy-duty,
honest,
influential,
frontal.