105 entries under heavy topic. ×

3
laggard(adjective, dull, quiet, easy, careless)
3
laid-back(adjective, dull, quiet, cool, weak)
2
boring(adjective, dull, quiet, flat, slow)
2
depressed(adjective, dull, quiet, flat, slow)
2
dragging(adjective, dull, slow, sluggish)
2
draggy(adjective, action, dull, quiet, flat)
2
hebetudinous(adjective, dull, slow, apathetic)
2
insensitive(adjective, dull, quiet, flat)
2
lymphatic(adjective, weak, still, sluggish)
2
obtuse(adjective, dull, stupid, impassive)
2
off(adjective, dull, moderate, low, slow)
2
out(adjective, dull, quiet, slow)
2
out of it(expression, adjective, idiom, dull, quiet)
2
sleepyhead(adjective, dull, quiet, weak, easy)
2
slow-moving(adjective, dull, quiet, easy, slow)
2
slumberous(adjective, dull, quiet, slow)
2
snoozy(adjective, dull, quiet, weak, easy)
2
soporific(quiet, tired, lethargic, sleepy)
2
stupid(adjective, dull, apathetic, sluggish)
2
unenthusiastic(adjective, dull, weak, easy, slow)
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APASmart Define. (2015). inactive thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/inactive/thesaurus/synonyms
ChicagoSmart Define. 2015. "inactive thesaurus" https://smartdefine.org/inactive/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, inactive thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/inactive/thesaurus/synonyms>.
MLASmart Define. "inactive thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/inactive/thesaurus/synonyms>