Etymology
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slackness (n.)

Old English slæcnes "slowness, remissness, laziness;" see slack (adj.) + -ness.

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Definitions of slackness

slackness (n.)
weakness characterized by a lack of vitality or energy;
slackness (n.)
the quality of being lax and neglectful;
Synonyms: laxness / laxity / remissness
slackness (n.)
the quality of being loose (not taut);
he hadn't counted on the slackness of the rope
Synonyms: slack
From wordnet.princeton.edu

Dictionary entries near slackness

slack

slacken

slacker

slack-jawed

slackly

slackness

slag

slain

slake

slalom

slam