6
amiss(adjective, rough, poor, inadequate, atrocious)
6
devoid(adjective, empty, wanting)
6
injured(adjective, poor, inadequate, imperfection, incomplete)
6
less(adjective, adverb, inferior, inferiority, smaller)
6
mean(adjective, weak, poor, small, common)
6
minus(adjective, poor, inadequate, lacking, shortcoming)
6
not enough(expression, adjective, idiom, poor, inadequate)
6
second-rate(adjective, weak, poor, miserable, inferior)
6
slight(adjective, weak, flat, poor, small)
6
small(adjective, light, weak, poor, low)
6
subpar(adjective, weak, poor, miserable, inferior)
6
thin(adjective, close, light, slight, poor)
5
contemptible(adjective, weak, poor, small, common)
5
crude(adjective, weak, poor, plain, miserable)
5
destitute(adjective, down, out, wanting)
5
failing(adjective, close, light, poor, short)
5
immature(adjective, poor, plain, inadequate, bare)
5
inapt(poor, inadequate, insufficient, scarce)
5
infrequent(adjective, poor, strange, exceptional, inadequate)
5
little(adjective, close, light, slight, poor)
11 years ago|30k views|share |citing 
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>