110 entries under sluggish topic. ×

12
shiftless(adjective, action, dull, moving, careless)
12
torpid(adjective, calm, dull, quiet, slow)
12
trifling(adjective, dull, slight, careless, indifferent)
10
quiet(adjective, calm, dull, easy, gentle)
10
slow(adjective, dull, fail, diminish, decrease)
9
lifeless(adjective, calm, dull, quiet, gentle)
9
supine(adjective, dull, quiet, easy, careless)
8
apathetic(adjective, dull, quiet, careless, indifferent)
8
quiescent(adjective, calm, dull, quiet, gentle)
8
sleepy(adjective, dull, quiet, flat, careless)
8
stagnant(adjective, calm, quiet, gentle, dirty)
8
static(adjective, calm, dull, quiet, flat)
7
do-nothing(adjective, action, dull, informal)
7
immobile(adjective, calm, dull, quiet, gentle)
7
inoperative(adjective, action, calm, dull, weak)
7
phlegmatic(adjective, quiet, easy, heavy, indifferent)
6
asleep(adjective, calm, dull, quiet, gentle)
6
dilatory(adjective, dull, quiet, easy, careless)
6
dull(adjective, careless, cold, indifferent, still)
5
easy(adjective, quiet, moderate, slow, heavy)
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APASmart Define. (2015). idle thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/idle/thesaurus/synonyms
ChicagoSmart Define. 2015. "idle thesaurus" https://smartdefine.org/idle/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, idle thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/idle/thesaurus/synonyms>.
MLASmart Define. "idle thesaurus" 23 October 2015. Web. 26 September 2026. <https://smartdefine.org/idle/thesaurus/synonyms>