unflagging and persistent; to not slack off or become lazy

(idiom) to persevere unremittingly; to keep going until the end; persistent

undisciplined, lazy, or listless in attitude or discipline

perfect and without any flaws that could be criticized or attacked; invulnerable; watertight

To be slack, lazy, or remiss in one's work or duties; to show a lack of diligence.

to be constantly prepared and never relax one's guard

slack; idle; sluggish

to work diligently from morning to night without rest; to be hardworking day and night

slack or relaxed in discipline and effort; negligent

to slacken one's efforts; to take it easy; to become lazy or negligent

careless and negligent; lazy and disrespectful in one's attitude

to relax or slacken (of discipline, efforts, or rules)

relentless; tireless; without slacking off; persistently

to be diligent and never slack off; to not be idle

to be diligent and tireless day and night; to work hard around the clock without slacking

indolence; laziness; inactivity; a lack of diligence or enthusiasm

to be relaxed or loose; not tight or firm