adj. Function: adjective
Synonyms: FAST 3, breakneck, expeditive, fleet, harefooted, hasty, quick, rapid, speedy, swift
Related Words: effective, effectual, efficacious, efficient; prompt, ready
Contrasted Words: ineffective, ineffectual, inefficacious, inefficient; dilatory, laggard, leisurely, slow
Antonyms: sluggish