idler

bum, good-for-nothing, neʼer-do-well

crawler, creeper, dawdler, laggard, putterer, slowpoke, snail, stick-in-the-mud, straggler

clock-watcher, goldbrick, malingerer, shirker, slacker

dallier, lingerer, loiterer, loller, lounger, saunterer

delayer, procrastinator

dropout, quitter