definition of
slackness

[1] #1 slackness n. [inanition, lassitude, lethargy] weakness characterized by a lack of vitality or energy. wn

[2] #2 slackness n. [slack] the quality of being loose (not taut); "he hadn't counted on the slackness of the rope". wn

[3] #3 slackness n. [laxness, laxity, remissness] the quality of being lax and neglectful. wn