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instantaneous Synonyms

Another word for instantaneous

Choosing another word for instantaneous depends on context, so the synonyms and similar words below are separated across 2 exact definitions and ranked by match strength.
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• adjective (Context 1)

Occurring, done, or completed in an instant, without any perceptible delay.

Usage Example

"Modern fiber-optic networks allow for almost immediate communication across continents."

Strongest
immediate
instant
Strong
split-second
prompt
sudden
rapid
swift
Weak
abrupt

• adjective (Context 2)

Existing, measured, or functioning at a particular, precise moment in time (especially in physics and mathematics).

Usage Example

"The speedometer displays the vehicle's momentary velocity rather than its average speed over the trip."

Strong
momentary

Opposites of instantaneous

The opposite of instantaneous shifts depending on context. Common opposites include:

gradual
delayed
cumulative
slow
protracted
continuous
prolonged
eventual
See all opposites of instantaneous

• Nearby Words

installment
instance
instant
instantaneous
instantaneously
instantly
instate

Cite this Entry

Wordmom. (2026). Synonyms for Instantaneous. In Wordmom Thesaurus. Retrieved Nov 5, 2026, from https://wordmom.com/synonyms/instantaneous
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