1. 松弛：slacking scraper 拖铲挖土机 | slackness 松弛 | slackoff test 慢钻试验

2. 船首偏下风松弛：slackness wool 矿渣棉 | slackness 船首偏下风松弛 | slackness 船首偏下风松弛;缓慢

3. 熔渣：slackness 船首偏下风松弛;缓慢 | slackness 熔渣 | slackwater navigation 平潮航行

4. 船首偏下风松弛;缓慢：slackness 船首偏下风松弛 | slackness 船首偏下风松弛;缓慢 | slackness 熔渣

noun

1. the quality of being lax and neglectful

Synonym: laxnesslaxityremissness

2. the quality of being loose (not taut)

e.g. he hadn't counted on the slackness of the rope

Synonym: slack

3. weakness characterized by a lack of vitality or energy

Synonym: inanitionlassitudelethargy