(normally said of a rope) Lax; not tense; not firmly extended. / Weak; not holding fast. / Moderately warm. / Moderate in speed. / Lacking diligence or care; not earnest or eager.

Slackly.

(uncountable) The part of anything that hangs loose, having no strain upon it. / (countable) A tidal marsh or shallow that periodically fills and drains.

Full of laxity; characterised by laxness; relaxed; (by extension) unmotivated, lazy.

plural of slackness

plural of Slack

A surname.

A large container full of water or oil or brine used by a blacksmith to quench hot metal.

A time, at the turn of the tide, when the water is calm. / A stretch of seawater in which there are no currents, or of a river impeded by a lock or dam.

Careless and inactive; lacking focus or initiative. / Done carelessly; slapdash. / Having or done with hands that are slack.