say it: SLUHG-ish-nuhs
sluggishness is a noun meaning "a state of comatose torpor (as found in sleeping sickness)". It carries 3 recorded senses.
the pace of things that move relatively slowly
“the sluggishness of the economy”
“the sluggishness of the compass in the Arctic cold”
inactivity; showing an unusual lack of energy
“the general appearance of sluggishness alarmed his friends”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for sluggishness come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.