Antonyms of adj lazy

2 senses of lazy

Sense 1
lazy -- (moving slowly and gently; "up a lazy river"; "lazy white clouds"; "at a lazy pace")

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")

Sense 2
faineant, indolent, lazy, otiose, slothful, work-shy -- (disinclined to work or exertion; "faineant kings under whose rule the country languished"; "an indolent hanger-on"; "too lazy to wash the dishes"; "shiftless idle youth"; "slothful employees"; "the unemployed are not necessarily work-shy")

INDIRECT (VIA idle) -> busy -- (actively or fully engaged or occupied; "busy with her work"; "a busy man"; "too busy to eat lunch")

Similarity of adj lazy

2 senses of lazy

Sense 1
lazy -- (moving slowly and gently; "up a lazy river"; "lazy white clouds"; "at a lazy pace")
       => 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")

Sense 2
faineant, indolent, lazy, otiose, slothful, work-shy -- (disinclined to work or exertion; "faineant kings under whose rule the country languished"; "an indolent hanger-on"; "too lazy to wash the dishes"; "shiftless idle youth"; "slothful employees"; "the unemployed are not necessarily work-shy")
       => idle (vs. busy) -- (not in action or at work; "an idle laborer"; "idle drifters"; "the idle rich"; "an idle mind")