dull: (of business) not active or brisk; "business is dull (or slow)"; "a sluggish market"
inert: slow and apathetic; "she was fat and inert"; "a sluggish worker"; "a mind grown torpid in old age"
(sluggishly) in a sluggish manner; "the smoke rose sluggishly"
(sluggishness) lethargy: a state of comatose torpor (as found in sleeping sickness)
(sluggishness) languor: inactivity; showing an unusual lack of energy; "the general appearance of sluggishness alarmed his friends"
Habitually idle and lazy; slothful; dull; inactive; as, a sluggish man; Slow; having little motion; as, a sluggish stream; Having no power to move one's self or itself; inert; Characteristic of a sluggard; dull; stupid; tame; simple
Sluggishness is fear of ensuing toil.
Unresponsive; functioning at below normal rate or level
Slow, bulky and difficult to maneuver. Some power-tool competition level skis when used on the groomed would elicit this feeling.