Slack
Slack adjective - Failing to give proper care and attention.
Slumbering and slack are semantically related In some cases you can use "Slumbering" instead the word "Slack" as an adjective or a verb.
Mutual synonyms
Cite this Source
Slumbering and Slack. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/slack/slumbering
Slack & Slumbering. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/slack/slumbering>.
Slumbering or Slack. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/slack/slumbering.
Google Ngram Viewer shows how "slack" and "slumbering" have occurred on timeline