Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun slackness

3 senses of slackness

Sense 1
inanition, lassitude, lethargy, slackness -- (weakness characterized by a lack of vitality or energy)
       => weakness -- (the property of lacking physical or mental strength; liability to failure under pressure or stress or strain; "his weakness increased as he became older"; "the weakness of the span was overlooked until it collapsed")

Sense 2
slack, slackness -- (the quality of being loose (not taut); "he hadn't counted on the slackness of the rope")
       => looseness, play -- (movement or space for movement; "there was too much play in the steering wheel")

Sense 3
laxness, laxity, remissness, slackness -- (the quality of being lax and neglectful)
       => negligence, neglect, neglectfulness -- (the trait of neglecting responsibilities and lacking concern)