60 entries under lacking topic. ×

10
substandard(adjective, weak, rough, poor, awful)
10
weak(adjective, slight, poor, false, small)
9
missing(adjective, poor, short, inadequate, exhausted)
9
rare(adjective, close, light, poor, exceptional)
8
impaired(adjective, poor, false, inferior, inadequate)
6
minus(adjective, poor, inadequate, shortcoming)
6
thin(adjective, close, light, slight, poor)
5
failing(adjective, close, light, poor, short)
5
infrequent(adjective, poor, strange, exceptional, inadequate)
5
unqualified(adjective, weak, poor, low, thin)
3
exiguous(adjective, close, light, weak, slight)
3
in short supply(expression, adjective, idiom, down, inadequate)
3
unequal(adjective, poor, inadequate, insufficient, scarce)
2
bankrupt(poor, exhausted, wanting, impoverished)
2
impecunious(flat, poor, exhausted, wanting)
2
insolvent(poor, exhausted, wanting, bankrupt)
2
needy(adjective, poor, exhausted, wanting)
2
penniless(poor, exhausted, wanting, bankrupt)
2
penurious(poor, exhausted, wanting, bankrupt)
2
pinched(flat, poor, exhausted, wanting)
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APASmart Define. (2015). deficient thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/deficient/thesaurus/synonyms
ChicagoSmart Define. 2015. "deficient thesaurus" https://smartdefine.org/deficient/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, deficient thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/deficient/thesaurus/synonyms>.
MLASmart Define. "deficient thesaurus" 13 April 2015. Web. 23 September 2026. <https://smartdefine.org/deficient/thesaurus/synonyms>