"slackness" in German slackness Nachlässigkeit Schlaffheit Lose Detailed translations for "slackness" slackness 1. general slackness(also: inattentiveness, negligence, perfunctoriness, heedlessness) die Nachlässigkeit{feminine} slackness(also: flaccidity, flabbiness, inertness, looseness) die Schlaffheit{feminine} 2. technology slackness die Lose{feminine} English synonyms for "slackness" slackness {n} inanition lassitude laxity laxness lethargy remissness slack