Synonyms for Take aback:

• n.

  •ball over (noun)
  • ball over.
  •blow out of the water (noun)
  • blow out of the water.
  •floor (noun)
  • floor.

• v.

  •astonish (verb)
  • bowl over,
  • flabbergast,
  • floor*,
  • boggle,
  • bewilder,
  • overwhelm,
  • confound,
  • stupefy,
  • daze,
  • stun,
  • shock.
  •astound (verb)
  • astonish,
  • confuse.
  •discomfit (verb)
  • annoy,
  • checkmate,
  • balk,
  • upset,
  • bother,
  • rattle,
  • beat,
  • discompose,
  • ruffle,
  • demoralize,
  • overcome,
  • trump,
  • embarrass,
  • worry,
  • vex,
  • foil,
  • fluster,
  • baffle,
  • irk,
  • disturb,
  • faze,
  • outwit,
  • unsettle,
  • discountenance,
  • perplex,
  • thwart,
  • abash,
  • perturb,
  • worst,
  • prevent.
  •disconcert (verb)
  • disarrange,
  • hinder,
  • foul up,
  • bug,
  • agitate,
  • puzzle,
  • discombobulate,
  • undo,
  • frustrate,
  • unbalance,
  • trouble.
  •dismay (verb)
  • disillusion,
  • dishearten,
  • muck up,
  • disquiet,
  • chill,
  • screw up,
  • throw into a tizzy,
  • terrify,
  • daunt,
  • louse up,
  • scare,
  • dispirit,
  • appall,
  • horrify,
  • flummox,
  • paralyze,
  • shake,
  • frighten,
  • affright,
  • distress,
  • mystify,
  • discourage,
  • unnerve,
  • throw,
  • mess up*,
  • unhinge,
  • terrorize,
  • alarm,
  • snafu.
  •nonplus (verb)
  • muddle,
  • mess with one's head,
  • throw*,
  • flurry,
  • buffalo,
  • rattle one's cage,
  • stick,
  • stymie*,
  • stump,
  • get*,
  • throw into tizzy.
  •stagger (verb)
  • consternate,
  • overpower.
  •startle (verb)
  • fright,
  • spook,
  • rock,
  • spring,
  • bolt,
  • jump.
  •surprise (verb)
  • catch unawares,
  • leave open-mouthed,
  • leave aghast,
  • petrify,
  • take one's breath away,
  • cause wonder,
  • strike with awe,
  • jolt.

• Other synonyms:

  •
  • amaze.
  •amaze
  • astound.
  •dismay
  • mystified,
  • mucked up,
  • snafued.
  •nonplus
  • Buffaloes,
  • buffaloed.
  •rebuke
  • smack down.
  •Other relevant words:
  • electrify,
  • Dumfound,
  • appal,
  • bowl down,
  • chagrin,
  • shatter,
  • mortify,
  • irritate,
  • bring up short,
  • start,
  • dazzle,
  • put out,
  • awe,
  • tax,
  • gall,
  • jar,
  • devastate,
  • shake up,
  • nettle,
  • strike,
  • HIT,
  • burden,
  • grate,
  • offend,
  • check,
  • stop,
  • knock for six,
  • humiliate.

Antonyms for Take aback:

• v.

  • astonish
    bore, calm, expect.
  • astound
    dull.
  • discomfit
    surrender, yield.
  • disconcert
    comfort, soothe.
  • dismay
    assure, encourage, make happy.
  • dumbfound
    clear up, lay out, explain, explicate.
  • nonplus
    educate, enlighten.
  • startle
    compose.