WordWeb Online

1. A state of comatose torpor (as found in sleeping sickness)
   - lethargy, lassitude
    
2. The pace of things that move relatively slowly
   "the sluggishness of the economy"; "the sluggishness of the compass in the Arctic cold"
    
3. Inactivity; showing an unusual lack of energy
   "the general appearance of sluggishness alarmed his friends";
   - languor, lethargy, phlegm, flatness

Type of: inactiveness, inactivity, inertia, pace, rate, torpidity, torpor