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 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
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