one at a time (adverb) independently: alone
Sinonime: apathetic, dallying, directionless, good-for-nothing,
idle,
inattentive,
incompetent,
indolent,
lackadaisical, laggard, lagging,
lethargic,
lifeless, loafing, procrastinating,
slack, slothful, unambitious, unenergetic, unindustrious, unmotivated
Antonime: dependently