170 entries under sluggish topic. ×

10
lazy(adjective, slow, careless, relaxed, indifferent)
10
lumpish(adjective, slow, heavy, impassive)
10
tired(adjective, set, beat, hard, weak)
10
unresponsive(adjective, calm, quiet, flat, slow)
10
weary(adjective, verb, upset, reduce)
9
lackadaisical(adjective, flat, low, sad, careless)
9
lackluster(adjective, light, simple, flat, excite)
9
languorous(adjective, flat, low, sad, slow)
9
supine(adjective, careless, relaxed, indifferent, idle)
8
insensate(noun, adjective, simple, attitude, slow)
8
passive(adjective, calm, flat, careless, indifferent)
8
unintelligent(adjective, simple, slow, silly, foolish)
7
down(adjective, bad, increase, simple, flat)
7
imbecilic(adjective, simple, slow, foolish, stupid)
7
neutral(adjective, flat, grim, pale)
7
simple-minded(adjective, simple, ability, slow, silly)
7
somnolent(noun, adjective, careless, relaxed, indifferent)
7
stagnant(adjective, quiet, hard, flat, warm)
7
stupefied(adjective, simple, slow, stupid, trivial)
7
vacant(adjective, stupid, dead, lifeless)
10 years ago|80k views|share |citing 
APASmart Define. (2016). dull thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/dull/thesaurus/synonyms
ChicagoSmart Define. 2016. "dull thesaurus" https://smartdefine.org/dull/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, dull thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/dull/thesaurus/synonyms>.
MLASmart Define. "dull thesaurus" 29 March 2016. Web. 26 September 2026. <https://smartdefine.org/dull/thesaurus/synonyms>