8
supine(adjective, dull, quiet, weak, easy)
8
unmoved(adjective, dull, flat, low, sad)
7
disinterested(adjective, calm, cool, temper, careless)
7
casual(adjective, calm, cool, relaxed, cheerful)
7
dispassionate(adjective, calm, cool, relaxed, indifferent)
7
enervated(adjective, dull, weak, easy, flat)
7
inattentive(adjective, dull, careless, indifferent, idle)
7
lax(adjective, slow, careless, indifferent, casual)
6
devil-may-care(adjective, easygoing, indifference, carefree)
6
dilatory(adjective, dull, quiet, easy, slow)
6
drowsy(adjective, dull, quiet, easy, careless)
6
easy(adjective, calm, dull, quiet, cool)
6
easygoing(adjective, calm, dull, cool, careless)
6
half-hearted(adjective, temper, cold, indifferent, negative)
6
insensible(adjective, temper, cold, indifferent, negative)
6
languishing(adjective, dull, weak, easy, flat)
6
remiss(adjective, dull, careless, casual, thoughtless)
6
tepid(adjective, temper, cold, indifferent, negative)
6
unemotional(adjective, calm, cool, relaxed, detached)
5
dopey(adjective, dull, weak, easy, flat)
10 years ago|21k views|share |citing 
APASmart Define. (2016). lackadaisical thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/lackadaisical/thesaurus/synonyms
ChicagoSmart Define. 2016. "lackadaisical thesaurus" https://smartdefine.org/lackadaisical/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, lackadaisical thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/lackadaisical/thesaurus/synonyms>.
MLASmart Define. "lackadaisical thesaurus" 2 March 2016. Web. 27 September 2026. <https://smartdefine.org/lackadaisical/thesaurus/synonyms>