1. (noun)inanition, lassitude, lethargy, slackness weakness characterized by a lack of vitality or energy Synonyms: languor, laxness, phlegm, lassitude, laxity, slack, listlessness, slackness, flatness, lethargy, sluggishness, remissness, inanition
2. (noun)slack, slackness the quality of being loose (not taut) Synonyms: slackness, falloff, remissness, inanition, slack water, laxity, lethargy, morass, falling off, laxness, lassitude, quag, mire, quagmire, slack, drop-off, slump
3. (noun)laxness, laxity, remissness, slackness the quality of being lax and neglectful Synonyms: slackness, laxity, lassitude, slack, laxness, lethargy, remissness, inanition
Synonyms, Thesaurus & Antonyms of 'slackness'
English Synonyms and Antonyms
1. slackness Neglect (L. nec, not, and lego, gather) is the failing to take such care, show such attention, pay such courtesy, etc., as may be rightfully or reasonably expected. Negligence, which is the s Synonyms: neglect, carelessness, heedlessness, negligence, scorn, default, inadvertence, omission, slackness, disregard, inattention, oversight, slight, disrespect, indifference, remissness, thoughtlessness, failure, neglectfulness
Synonyms for slackness 
