Synonyms for Instantaneously:

• adv.

  •early (adverb)
  • without delay.
  •impulsively (adverb)
  • spontaneously,
  • extemporaneously,
  • impulsively,
  • rashly,
  • reflexively,
  • hastily,
  • abruptly.
  •promptly (adverb)
  • right away,
  • directly,
  • pronto,
  • quickly,
  • spontaneously,
  • immediately,
  • at once.
  •suddenly (adverb)
  • suddenly,
  • all of a sudden,
  • at once,
  • unexpectedly,
  • quickly,
  • precipitously,
  • immediately,
  • instantly.
  •timelessly (adverb)
  • Timelessly.
  •transiently (adverb)
  • rootlessly,
  • Flickeringly,
  • transiently,
  • Passingly,
  • cursorily,
  • briefly,
  • temporarily,
  • transitorily,
  • Fleetingly,
  • restlessly,
  • Evanescently,
  • impermanently,
  • momentarily.

• adv

  •early (adverb)
  • in no time,
  • in a jiffy.
  •fast (adverb)
  • quickly.
  •impulsively (adverb)
  • spontaneously,
  • extemporaneously,
  • impulsively,
  • rashly,
  • reflexively,
  • hastily,
  • abruptly.
  •suddenly (adverb)
  • immediately,
  • suddenly,
  • hastily,
  • at once,
  • instantly,
  • all of a sudden,
  • quickly,
  • unexpectedly,
  • abruptly,
  • precipitously.
  •timelessly (adverb)
  • immediately,
  • instantly,
  • Timelessly.
  •transiently (adverb)
  • rootlessly,
  • Flickeringly,
  • transiently,
  • Passingly,
  • cursorily,
  • briefly,
  • temporarily,
  • transitorily,
  • Fleetingly,
  • restlessly,
  • Evanescently,
  • impermanently,
  • momentarily.

• n.

  •instantaneously (noun)
  • in a flash,
  • instantly,
  • outright.

• Other synonyms:

  •Other relevant words:
  • insistently,
  • in haste,
  • pop,
  • hurriedly,
  • in a second,
  • presto,
  • momently,
  • right now,
  • at short notice,
  • this minute,
  • just now,
  • unhesitatingly,
  • in real time,
  • rapidly,
  • in no time,
  • exigently,
  • like a shot,
  • straightway,
  • in a while,
  • right off,
  • precipitately,
  • Subito,
  • in a jiffy,
  • outright,
  • out of hand,
  • amain,
  • just then,
  • apace,
  • direct,
  • instantaneous,
  • shortly,
  • Precipitantly,
  • like,
  • per saltum,
  • split second,
  • punctually,
  • on the dot,
  • without delay,
  • discontinuously,
  • expeditiously,
  • surprisingly,
  • straightaway,
  • readily,
  • straight,
  • slap,
  • promptly,
  • tout de suite,
  • unawares,
  • Straightforth,
  • this instant,
  • in short order,
  • at a stroke,
  • in a moment,
  • p.d.q.,
  • summarily,
  • directly,
  • Posthaste,
  • swiftly,
  • early,
  • trippingly,
  • on the double,
  • concurrently,
  • straight off,
  • right away,
  • dramatically,
  • like a flash,
  • Tantivy,
  • on the nail,
  • Lickety Split,
  • forthwith,
  • like greased lightning,
  • offhand,
  • shot,
  • in nothing flat,
  • straight away,
  • now,
  • in a minute,
  • double-quick,
  • without notice,
  • expressly,
  • pronto,
  • in a flash,
  • at full speed,
  • haste,
  • instant,
  • PDQ,
  • like lightning,
  • speedily,
  • post-haste,
  • without hesitation,
  • plump,
  • extempore,
  • all at once,
  • without warning,
  • fast,
  • at sight,
  • in a wink,
  • Incontinently,
  • Instanter,
  • in a trice.

Antonyms for Instantaneously:

• adv.

  • Other antonyms:
    late, slowly, tardily.