Antonyms of adj high-speed

1 sense of high-speed

Sense 1
high-speed, high-velocity -- (operating at high speed; "a high-speed food processor"; "a high-velocity shell")

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 high-speed

1 sense of high-speed

Sense 1
high-speed, high-velocity -- (operating at high speed; "a high-speed food processor"; "a high-velocity shell")
       => 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")