Antonyms of adj instantaneous

1 sense of instantaneous

Sense 1
instantaneous, instant (prenominal) -- (occurring with no delay; "relief was instantaneous"; "instant gratification")

INDIRECT (VIA fast) -> slow -- (not moving quickly; taking a comparatively long time; "a slow walker"; "the slow lane of traffic"; "her steps were slow"; "he was slow in reacting to the news"; "slow but steady growth")

Similarity of adj instantaneous

1 sense of instantaneous

Sense 1
instantaneous, instant (prenominal) -- (occurring with no delay; "relief was instantaneous"; "instant gratification")
       => fast (vs. slow) -- (acting or moving or capable of acting or moving quickly; "fast film"; "on the fast track in school"; "set a fast pace"; "a fast car")