Synonyms for Know it all:

• adj.

  •arrogant (adjective)
  • disdainful,
  • pompous,
  • sniffy,
  • puffed up,
  • know-it-all,
  • on an ego trip,
  • conceited,
  • smarty,
  • cold-shoulder,
  • superior,
  • bragging,
  • uppity,
  • insolent,
  • bossy,
  • domineering,
  • lordly,
  • high-handed,
  • autocratic,
  • audacious,
  • self-important,
  • cheeky,
  • swaggering,
  • pretentious,
  • vain,
  • supercilious,
  • snotty,
  • assuming,
  • contemptuous,
  • scornful,
  • overbearing,
  • high and mighty,
  • cavalier,
  • haughty,
  • stuck up,
  • cool,
  • egotistic,
  • smug,
  • snooty,
  • aloof,
  • proud,
  • cocky,
  • biggety,
  • snippy,
  • presumptuous,
  • peremptory,
  • imperious.
  •boastful (adjective)
  • exultant,
  • puffed-up,
  • self-aggrandizing,
  • big,
  • arrogant,
  • self-applauding,
  • hot stuff,
  • egotistical,
  • too big for one's britches,
  • smart-alecky,
  • big-headed,
  • on ego trip,
  • hifalutin,
  • vainglorious,
  • Strutting,
  • swollen-headed,
  • Vaunting,
  • crowing,
  • full of hot air,
  • stuck-up,
  • bombastic,
  • swanky,
  • loudmouth.
  •cocky (adjective)
  • cocksure,
  • hotdogger.
  •cocky/cocksure (adjective)
  • confident,
  • hubristic,
  • smart guy,
  • bumptious,
  • smarty pants,
  • nervy,
  • overweening,
  • self-confident,
  • sure,
  • hotdogging,
  • positive,
  • overconfident,
  • certain,
  • brash.
  •conceited (adjective)
  • gall,
  • narcissistic,
  • conceity,
  • bigheaded,
  • immodest,
  • big talking,
  • ham,
  • phony.
  •prideful (adjective)
  • high-and-mighty,
  • lofty,
  • on one's high horse.
  •self-centered (adjective)
  • self-indulgent,
  • egocentric,
  • grandstanding,
  • Self-interested,
  • selfish,
  • stuck on oneself,
  • self-serving,
  • self-absorbed,
  • self-sufficient,
  • egoistic,
  • having a swelled head,
  • inward-looking,
  • egomaniacal,
  • self-seeking,
  • self-involved,
  • independent,
  • wrapped up with oneself.
  •self-confident (adjective)
  • hotdog,
  • sure of oneself,
  • self-reliant,
  • self-assured,
  • fearless,
  • Undoubtful,
  • assured,
  • poised,
  • sanguine.
  •snotty (adjective)
  • highfalutin',
  • fresh,
  • la-de-da,
  • snobby,
  • sassy,
  • impertinent.
  •uppity (adjective)
  • snobbish,
  • high falutin.

• n.

  •bighead (noun)
  • egomaniac.
  •bigmouth (noun)
  • brag,
  • blowhard,
  • bag of wind,
  • show-off,
  • trumpeter,
  • blusterer,
  • gasbag,
  • gossiper,
  • bull-thrower,
  • grandstander,
  • boaster,
  • bragger,
  • swelled head,
  • big talker,
  • bull artist.
  •braggart (noun)
  • exhibitionist,
  • Gascon,
  • big-timer,
  • braggadocio,
  • bigmouth,
  • hotshot,
  • ranter,
  • swaggerer,
  • swashbuckler,
  • Strutter,
  • raver,
  • peacock,
  • egotist,
  • blatherskite.
  •egghead (noun)
  • geek,
  • longhair,
  • scholar,
  • rocket scientist,
  • bookworm,
  • thinker,
  • bluestocking,
  • genius,
  • highbrow.
  •pedagogue (noun)
  • pedant,
  • sophist.
  •saucebox (noun)
  • Malapert,
  • Witling.
  •smart-aleck (noun)
  • wisenheimer,
  • wiseass,
  • smart ass.
  •smart aleck (noun)
  • swellhead.
  •windbag (noun)
  • jabberer,
  • blabberer,
  • motor-mouth.
  •wise guy (noun)
  • criminal,
  • mobster,
  • hoodlum,
  • mafioso,
  • crook,
  • member of the family,
  • hood.

Antonyms for Know it all:

• adj.

  • arrogant
    meek, shy, unconceited, humble, servile, unsure, modest, timid.
  • boastful
    deprecating.
  • cocky
    cautious, tentative.
  • cocky/cocksure
    uncertain, unself-confident.
  • conceited
    diffident, self-conscious.
  • self-centered
    benevolent, giving, unselfish.
  • self-confident
    insecure.

• n.

  • learned person
    ignoramus.