Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

Thesaurus

instantaneous

adjective

Synonyms and Antonyms of instantaneous

  1. done or occurring without any noticeable lapse in time <the thunder following the flash of lightning was nearly instantaneous> Synonyms immediate, instant, split-second, straightaway Related Words summary; fast, hit-and-run, prompt, quick, rapid, speedy, swift Near Antonyms dilatory, tardy; slow, sluggish; prolonged, protracted; deferred, delayed





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).

WORD OF THE DAY

at a gallop

Get Word of the Day daily email!