Merriam-Webster Logo
SINCE 1828
Menu
dictionary thesaurus

Thesaurus

instantaneous

adjective

Synonyms and Antonyms of instantaneous

done or occurring without any noticeable lapse in time
  • the thunder following the flash of lightning was nearly instantaneous
Synonyms of instantaneous

immediate, instant, split-second, straightaway
Words Related to instantaneous

summary

fast, hit-and-run, prompt, quick, rapid, speedy, swift
Near Antonyms of instantaneous

dilatory, tardy

slow, sluggish

prolonged, protracted

deferred, delayed

Learn More about instantaneous

  1. See words that rhyme with instantaneous Dictionary: Definition of instantaneous Spanish Central: Translation of instantaneous Nglish: Translation of instantaneous for Spanish speakers Britannica English: Translation of instantaneous for Arabic speakers

Seen and Heard

What made you want to look up instantaneous? Please tell us where you read or heard it (including the quote, if possible).

show comments hide comments

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

hamartia

Listen to the pronounciation of hamartia

a flaw that causes the downfall of a hero

Get Word of the Day daily email!

TRENDING NOW

  1. mendacious, mendacity George Conway calls Trump a liar

  2. crawdad New novel makes waves

  3. non sequitur, sequitur Manafort judge addresses defense

SEE ALL

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Words at Play

Ask the Editors

Word Games