Slack

dust consisting of a mixture of small coal fragments and coal dust and dirt that sifts out when coal is passed over a sieve

a noticeable deterioration in performance or quality

a stretch of water without current or movement

a soft wet area of low-lying land that sinks underfoot

the quality of being loose (not taut)

a cord or rope or cable that is hanging loosely

avoid responsibilities and work, be idle

be inattentive to, or neglect

release tension on

make less active or fast

become slow or slower

make less active or intense

become less in amount or intensity

cause to heat and crumble by treatment with water

not tense or taut

flowing with little speed as e.g. at the turning of the tide

lacking in rigor or strictness