leisurely Antonyms

snell against the clock activated overdrive suddenly unhesitatingly at once instantaneously spontaneously alacritous of a sudden chop-chop just then quicky quickie straightaway straight off right away like a shot whirlwind volant studious straightway steadfastly splitting speedy speedily speeder soon subitaneous subito urgently turbo tantivy swiftly swifter swift summarily sudden in short order like crazy like hell pronto post haste on the spot on the fly like the wind like a bat out of hell full tilt before you can say knife