Synonyms of instantaneously

instantaneously

adverb

as in immediately

without delay

I had just slammed the car door shut when I instantaneously remembered that I had left the keys inside

Synonyms & Similar Words

• immediately
• instantly
• promptly
• now
• directly
• quickly
• right
• shortly
• suddenly
• soon
• away
• forthwith
• straightaway
• at once
• incontinently
• bang
• right now
• off the bat
• right off
• in no time
• right away
• on the spot
• straight off
• presently
• straightway
• on the double
• rapidly
• swiftly
• abruptly
• headlong
• instanter
• momentarily
• PDQ
• freely
• on a dime
• readily
• pronto
• plumb
• speedily
• fast
• quick
• unexpectedly
• hastily
• briskly
• swift
• impulsively
• apace
• presto
• recklessly
• impetuously
• fleetly
• rashly
• punctually
• opportunely
• seasonably
• anon
• posthaste
• snappily
• full tilt
• exactly

Antonyms & Near Antonyms

• slowly
• late
• tardily

Example Sentences

Recent Examples of instantaneously

As the gas rapidly accumulates within these tiny crevices, the bubbles expand almost instantaneously and push the beverage violently out of the bottle to create a soda fountain, also called a geyser. — Encyclopedia Britannica, 5 Aug. 2026

Building cars is one thing, but building that kind of instantaneously recognizable brand requires a deft hand. — Michael Teo Van Runkle, Forbes.com, 1 Aug. 2026

As fresh visual information reaches the brain, these models are updated almost instantaneously, allowing movements to be adjusted before conscious awareness has caught up. — Michelle Spear, Scientific American, 11 July 2026

The chicken and the egg come into existence instantaneously and simultaneously. — Peter Gosselin, Harpers Magazine, 30 June 2026

Almost instantaneously, Garcia drew his weapon and fired nine shots at Denis’s departing vehicle. — Brittany Wallman, Miami Herald, 24 June 2026

That happened instantaneously in a way no other life experience has affected us before. — Breanne L. Heldman, PEOPLE, 23 June 2026

Friendships are formed instantaneously; by day four, these men know each other more deeply than many of their friends and relatives. — Rob Picheta, CNN Money, 21 June 2026

With the entrance of radio and television, information was transmitted instantaneously and universally, yet the public grew passive, absorbing news without necessarily acting on it. — Alex Ross, New Yorker, 15 June 2026