Found 2 items, similar to slackness.
English → English (WordNet) Definition: slackness slackness n : the condition of being loose (not taut); “he hadn't counted on the slackness of the rope” [syn: slack]
English → English (gcide) Definition: Slackness Slackness \Slack"ness\, n. The quality or state of being slack. [1913 Webster]