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

Synonyms for Serious:

• adj.

  •adult (adjective)
  • virile,
  • of age,
  • reasonable,
  • mature,
  • full-grown,
  • developed,
  • adult,
  • nubile.
  •bad (adjective)
  • painful.
  •big league (adjective)
  • strictly business,
  • playing hard ball,
  • four-star,
  • high-power,
  • front page,
  • front-page.
  •businesslike (adjective)
  • workaday,
  • well-ordered,
  • disciplined.
  •composed (adjective)
  • sure of oneself,
  • Disimpassioned,
  • Soothed,
  • keeping one's shirt on,
  • not turn a hair,
  • levelheaded,
  • keeping a stiff upper lip,
  • cool as cucumber,
  • at ease,
  • have one's act together.
  •critical (adjective)
  • high-priority,
  • Exceptive,
  • all-important,
  • risky,
  • pivotal.
  •crucial, weighty (adjective)
  • meaning business,
  • of consequence,
  • grievous,
  • smoking,
  • momentous,
  • difficult,
  • fateful,
  • menacing,
  • no laughing matter,
  • tough,
  • far-reaching,
  • strenuous,
  • major,
  • Operose,
  • formidable,
  • fell,
  • worrying,
  • out for blood,
  • no joke,
  • laborious,
  • arduous,
  • unamusing,
  • sobering,
  • threatening.
  •dangerous (adjective)
  • on collision course,
  • shaky,
  • Jeopardous,
  • portentous,
  • parlous,
  • dangersome.
  •deep (adjective)
  • hard to understand,
  • orphic,
  • wisest,
  • sibylline,
  • hermetic.
  •enthusiastic (adjective)
  • fervent.
  •expressionless (adjective)
  • deadpan.
  •funereal (adjective)
  • dirgelike.
  •hard (adjective)
  • uphill battle,
  • unsparing,
  • Difficile,
  • effortful,
  • harder,
  • Toilful.
  •heavy (adjective)
  • Heightened,
  • Acroamatic.
  •heightened (adjective)
  • te.
  •hell-bent (adjective)
  • hellbent,
  • hell-bent.
  •important (adjective)
  • mattering much,
  • major league,
  • eternal,
  • big-wig,
  • prominent,
  • big-name,
  • telling,
  • hot,
  • mere,
  • dominant,
  • focal,
  • distinguished,
  • of moment,
  • newsworthy,
  • epoch-making,
  • big league,
  • vitally,
  • eminent,
  • fundamental,
  • all-consuming,
  • of substance,
  • noteworthy,
  • sacred,
  • make-or-break,
  • earthshaking,
  • especial,
  • considerable,
  • special,
  • importunate,
  • central,
  • historic,
  • sacrosanct,
  • high-powered,
  • signal,
  • key,
  • front and center,
  • vital,
  • heavyweight,
  • crucial,
  • of note,
  • monumental,
  • valuable,
  • world-shaking,
  • landmark,
  • cardinal,
  • influential,
  • salient.
  •incurable (adjective)
  • out of time,
  • Immedicable,
  • nowhere to go,
  • uncorrectable,
  • irrecoverable,
  • inoperable,
  • Remediless,
  • unrecoverable.
  •life-and-death (adjective)
  • vitally important,
  • earth-shaking,
  • life or death,
  • life and death,
  • of vital importance,
  • earthshattering,
  • earth-shattering.
  •major (adjective)
  • out-standing,
  • pre-eminent,
  • stellar.
  •material (adjective)
  • pointful,
  • ad rem,
  • applicative.
  •no-nonsense (adjective)
  • no nonsense.
  •Other relevant words: (adjective)
  • up-front,
  • dying to,
  • solid,
  • top drawer,
  • decided,
  • important,
  • the end,
  • devout,
  • poker-faced,
  • thoughtful,
  • carrying a lot of weight,
  • notable,
  • sincere,
  • splasher,
  • falling all over oneself,
  • life-and-death,
  • pretensionless,
  • patriarchal,
  • heart and soul,
  • Rememberable,
  • heavy-duty,
  • nasty,
  • bound and determined,
  • down in mouth,
  • sedate,
  • pensive,
  • hard,
  • heat-on,
  • coldblooded,
  • austere,
  • hopped up,
  • gotta have,
  • hard-as-nails,
  • hotblooded,
  • unidealistic,
  • out and out,
  • lost in thought,
  • determined,
  • blue chip,
  • unassertive,
  • material,
  • twenty-four carat,
  • laid back,
  • never-failing,
  • on up and up,
  • heart-rending,
  • hardboiled,
  • on the line,
  • profound,
  • wholehearted,
  • set on,
  • sure enough,
  • studious,
  • resolute,
  • unassured,
  • heavy,
  • matter of fact,
  • ugly,
  • upfront,
  • bigtime,
  • hurry-up,
  • terrible,
  • Dead level,
  • super colossal,
  • nobody home,
  • Museful,
  • on line,
  • singleminded,
  • philosophic,
  • sober,
  • life-threatening,
  • significant,
  • no fooling,
  • stand-out,
  • head ache,
  • dead-level,
  • acute,
  • straight-faced,
  • of great consequence,
  • unsentimental,
  • distingue,
  • urgent,
  • go great guns,
  • unimpassioned,
  • most reverend,
  • top-priority,
  • Undissembled,
  • dangerous,
  • something else,
  • onerous,
  • strong-minded,
  • matriarchal,
  • cold sober,
  • incurable,
  • heart-and-soul,
  • consequential,
  • Celebrious,
  • composed,
  • hard as nails,
  • demure,
  • depressive,
  • bodacious,
  • subdued,
  • major-league,
  • touch and go,
  • out of spirits,
  • high-profile,
  • meaningful,
  • critical,
  • overtaxing,
  • extra ordinary.
  •resolute (adjective)
  • dead set on,
  • constant,
  • true,
  • courageous,
  • diligent,
  • unflinching,
  • stubborn,
  • thorough,
  • plucky,
  • deliberate,
  • faithful,
  • unchangeable,
  • resolved,
  • earnest,
  • unbending,
  • ruthless,
  • intent,
  • steely,
  • unyielding,
  • relentless,
  • stern,
  • spunky,
  • fearless,
  • indefatigable,
  • tenacious,
  • staunch,
  • dauntless,
  • headstrong,
  • bullheaded,
  • strong-willed,
  • indomitable,
  • uncompromising,
  • reliable,
  • dogged,
  • unwavering,
  • zealous,
  • devoted,
  • valiant,
  • inexorable,
  • unshakeable,
  • bold,
  • dedicated,
  • firm,
  • hearty,
  • steady,
  • iron-willed,
  • set,
  • loyal,
  • implacable,
  • steadfast,
  • willing,
  • insistent,
  • decisive,
  • tireless,
  • persistent,
  • committed,
  • intent upon,
  • persevering.
  •respected (adjective)
  • venerable.
  •ruminative (adjective)
  • in a brown study,
  • in brown study,
  • ruminative.
  •severe (adjective)
  • ironhanded,
  • flinty,
  • iron-handed,
  • unsmiling,
  • hardnosed,
  • severe,
  • bad.
  •sober (adjective)
  • took the pledge,
  • low key,
  • not drunk,
  • unexcited,
  • nonindulgent,
  • abstinent,
  • forgoing,
  • Clear-headed.
  •solid (adjective)
  • law-abiding.
  •somber, humorless (adjective)
  • pokerfaced,
  • long-faced,
  • genuine,
  • grim,
  • weighty,
  • downbeat,
  • contemplative,
  • go for broke,
  • honest,
  • reflective,
  • unhumorous,
  • bound,
  • solemn,
  • meditative.
  •studious (adjective)
  • hard-working,
  • well-informed.
  •substantial (adjective)
  • big-deal,
  • well-built,
  • goodly.
  •wholehearted (adjective)
  • whole-hearted.

• n.

  •
  • large,
  • enormous,
  • extensive,
  • high,
  • huge,
  • big,
  • great,
  • widely,
  • pressing.
  •
  • in the process of doing something,
  • attitude,
  • complicit,
  • engaged,
  • submerged,
  • staid,
  • active,
  • actively,
  • concerned,
  • involved,
  • be harnessed to.
  •
  • ruinous,
  • damaging,
  • disastrous,
  • injurious,
  • no-nonsense,
  • businesslike,
  • harmful,
  • work,
  • sobersided.
  •
  • on edge,
  • frightened,
  • upset,
  • nervous,
  • uneasy,
  • troubled,
  • alarmed,
  • anxious,
  • help,
  • tense,
  • worried.
  •
  • dally with,
  • date,
  • cheat,
  • go out,
  • go together,
  • carry on,
  • cohabit,
  • fool around,
  • court,
  • go with.
  •
  • substantial,
  • funereal,
  • officious,
  • deep,
  • humorlessly,
  • stolid.
  •Other relevant words: (noun)
  • grave.

• v.

  •intensified (verb)
  • intense.

• Other synonyms:

  •
  • worrisome,
  • desperate,
  • disconcerting,
  • extravagant,
  • daunting,
  • ominous,
  • much,
  • oppressive,
  • ferocious,
  • severely,
  • distressing,
  • frontal,
  • draconian,
  • Nail Biting,
  • fatally,
  • sublime,
  • ultimate,
  • disturbing,
  • rigorous,
  • keen,
  • scalding,
  • fervid,
  • dearly,
  • nerve-wracking,
  • stressful,
  • disquieting,
  • keenly,
  • dreadfully,
  • classical,
  • suspicious,
  • gross,
  • towering,
  • lighten up.
  •
  • Searing,
  • terminal,
  • foreboding,
  • humorless,
  • fraught,
  • merciless,
  • frightening,
  • far,
  • sickening,
  • badly,
  • spectacular,
  • dire,
  • explosive,
  • fatal,
  • massive,
  • tall,
  • supreme,
  • rigid,
  • sharply,
  • uphill,
  • unsettled,
  • niggling,
  • brooding,
  • alarmist,
  • unbearable.
  •
  • stiff,
  • extreme,
  • savage,
  • proper,
  • sore,
  • high-level,
  • crushing.
  •
  • awful.
  •
  • seriously.
  •
  • strong.
  •stately
  • dignified.