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

Moreover, much of the footage on September 11 was digital, and therefore easier to compress electronically to share instantaneously. — David Friend, Vanity Fair, 10 Sep. 2026

Neurons don’t respond instantaneously to incoming signals; their responses can depend on input received over the previous few hundred milliseconds. — Anirban Mukhopadhyay, Scientific American, 7 Sep. 2026

More phones popped out to document this monumental scene when the chorus dropped and Engelbert instantaneously turned into an auntie. — Candace Buckner, New York Times, 5 Sep. 2026

Also, if the switch from side by side to one-front/one-back happened instantaneously, your brain would get confused about how to interpret the images delivered from each eye, since the setup would be quite different from what you were used to. — Abigail Witmer, The Conversation, 31 Aug. 2026

While fans have clamored for tickets, many were disappointed and frustrated with high prices and limited availability that seemed to sell out almost instantaneously. — Los Angeles Times, 21 Aug. 2026

The secret lies in servo motors at the end of each propeller arm, which instantaneously tilt the props fore and aft as needed. — New Atlas, 10 Aug. 2026

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