comparative form of sluggish: more sluggish

Habitually idle and lazy; slothful; dull; inactive / Slow; having little motion. / Having no power to move oneself or itself; inert. / Characteristic of a sluggard; dull; stupid; tame; simple.

The property of being sluggish, unable or unwilling to act quickly. / The state of economic decline, inactivity, slow or subnormal growth.

plural of sluggishness

(historical, medicine) A diagnostic category used in Soviet Russia to describe a supposedly slowly progressive form of schizophrenia affecting minimally symptomatic or asymptomatic individuals.