Antonyms of adj dilatory

1 sense of dilatory

Sense 1
dilatory, laggard, poky, pokey -- (wasting time)

INDIRECT (VIA slow) -> fast -- (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")

Similarity of adj dilatory

1 sense of dilatory

Sense 1
dilatory, laggard, poky, pokey -- (wasting time)
       => slow (vs. fast) -- (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")