Synonyms for Over-confidence:

• n.

  •brashness (noun)
  • hutzpah,
  • hutzpa,
  • chutzpa.
  •cheekiness (noun)
  • irreverence.
  •egoism/egotism (noun)
  • haughtiness,
  • egocentricity,
  • self-importance,
  • overconfidence,
  • self-confidence,
  • ostentation,
  • egomania,
  • Self-admiration,
  • presumption,
  • Conceitedness,
  • selfishness,
  • pride,
  • preoccupation with self,
  • self-worship,
  • narcissism,
  • self-regard,
  • boastfulness,
  • self-possession,
  • self-love,
  • boasting,
  • arrogance,
  • vanity,
  • superiority,
  • vainglory,
  • bragging,
  • megalomania,
  • swellheadedness,
  • self-absorption,
  • conceit,
  • self-interest,
  • gasconade,
  • Vaunting.
  •overconfidence (noun)
  • cheekiness,
  • sassiness,
  • spunk,
  • defiance,
  • face,
  • cockiness,
  • pertness,
  • brashness,
  • audacity,
  • guts,
  • effrontery,
  • nerviness,
  • audaciousness,
  • stuff,
  • Impudency,
  • rudeness,
  • brass,
  • cheek,
  • gall,
  • hardiness,
  • crust,
  • shamelessness,
  • nerve,
  • sauciness,
  • assumption,
  • disrespectfulness,
  • moxie,
  • incivility,
  • gutsiness,
  • boldness,
  • forwardness,
  • impertinence,
  • chutzpah,
  • pushiness,
  • temerity,
  • discourtesy,
  • Familiarity,
  • brazenness,
  • presumptuousness,
  • disrespect,
  • insolence,
  • assurance.
  •pride (noun)
  • loftiness,
  • superciliousness,
  • smugness,
  • contumely,
  • airs,
  • egotism,
  • swagger,
  • huff,
  • patronage,
  • pretentiousness,
  • egoism,
  • immodesty,
  • proud flesh,
  • swelled head,
  • Hauteur,
  • disdain,
  • Self-exaltation,
  • condescension,
  • big-headedness,
  • superbity,
  • disdainfulness,
  • hubris,
  • pragmatism,
  • snobbery.
  •self-absorption (noun)
  • self-involvement,
  • egocentrism,
  • self-centeredness.
  •temerariousness (noun)
  • incautiousness.
  •temerity (noun)
  • heedlessness,
  • hardihood,
  • pluck,
  • hastiness,
  • intrusiveness,
  • daring,
  • venturesomeness,
  • impudence,
  • recklessness,
  • imprudence,
  • impulsiveness,
  • rashness,
  • carelessness,
  • indiscretion,
  • precipitation,
  • precipitancy,
  • foolhardiness,
  • intrepidity,
  • precipitateness,
  • thoughtlessness,
  • impetuosity.
  •vainglory (noun)
  • Strutting.

• Other synonyms:

  •n.
  • pretension,
  • self-centredness.

Antonyms for Over-confidence:

• n.

  • cheekiness
    regard, reverence.
  • egoism/egotism
    altruism, selflessness.
  • overconfidence
    cowardice, meekness, respect, reserve, doubt, politeness, shyness, humility, caution, carefulness, manners, modesty, care, fear, timidity.
  • pride
    reality, truth, disgrace, realness.
  • temerity
    forethought, hesitation.