Synonyms for Listlessness:

n.

hebetude, languidness, stupor, leadenness, action. impassivity, unresponsiveness, uninterest, unconcern, Incuriousness, feelings, Incuriosity, Insensibleness, stolidness, disinterest, stolidity. boredom (noun)
tedium, boredom, indifference, dullness, ennui, monotony, dreariness, apathy.
dullness (noun)
slowness, languidness.
fatigue (noun)
faintness, weariness.
feeling (noun)
languor, lassitude.
idleness (noun)
lethargy, languor, passivity, indifference, laziness, inactivity, disinterest.
inertia (noun)
immobility, drowsiness, paralysis.
inertness (noun)
idleness, Inanimation, hibernation, inactivity, sluggishness, immobility, motionlessness, lethargy, reposefulness, dormancy, languor, stagnancy, paralysis, passivity, insensibility, inertness, lifelessness, catatonia, coma, stillness.
lethargy (noun)
laziness, slothfulness, torpor, indolence, tiredness, slowness.
listlessness (noun)
lassitude, torpor, torpidity, torpidness, languor.
vegetation (noun)
hibernation.
weariness (noun)
depression, blues, exhaustion, drowsiness, sleepiness, footsoreness, fatigue, debilitation, weakness, cheerlessness, over-weariness, droopiness, flaccidity, weariness, faintness, feebleness.

Other synonyms:

stolidity, hebetude, uninterest, unresponsiveness, stolidness, Incuriosity, impassivity, Incuriousness, Insensibleness, leadenness. stupor, disinterest, unconcern. Other relevant words:
stupor, stolidity, torpidity, unconcern, leadenness, Insensibleness, lassitude, Incuriosity, hebetude, stolidness, unresponsiveness, impassivity, languidness, torpidness, disinterest, uninterest, Incuriousness.

Usage examples for listlessness

  1. " But," he added, with a shade more listlessness than before, " Society has become accustomed to do without them, and does ill without them, but we must conform to her." – Red Pottage by Mary Cholmondeley
  2. His listlessness was gone and, paying no attention to those about him, he gazed fixedly at Tad. – Cy Whittaker's Place by Joseph C. Lincoln
  3. " The way did not open" for them to be so active; and why should his zeal rebuke their listlessness – Isaac T. Hopper by L. Maria Child