1) How a sluggard acts 2) How a sluggard moves 3) How noble gases behave 4) In a sluggish way 5) In an inactive way 6) Inactively 7) Insensibly 8) Lifelessly 9) Limply 10) Motionlessly 11) Reflexively 12) Sans animation 13) Submissively 14) Unreceptively 15) Unresponsively 16) With little movement 17) Without interest 
• (adv.) Without activity; sluggishly.
In·ert'ly adverb Without activity; sluggishly. Pope.