Slack
Sluggish
Sluggish adjective - Slow to move or act.
Usage example: reptiles are naturally sluggish at low temperatures
Slack is a synonym for sluggish in behaviour topic. You can use "Slack" instead the word "Sluggish" as an adjective or a noun, if it concerns topics such as dull, inactive, increase. popular alternative
Nearby Words: sluggishness, sluggishly
Mutual synonyms
Cite this Source
Sluggish and Slack. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/slack/sluggish
Slack & Sluggish. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/slack/sluggish>.
Sluggish or Slack. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/slack/sluggish.
Google Ngram Viewer shows how "slack" and "sluggish" have occurred on timeline