| subnormal(adjective, weak, poor, miserable, inferior) | |
| thick(adjective, dull, simple, flat, poor) | |
| tight(adjective, poor, small, insignificant, unimportant) | |
| trivial(adjective, dull, weak, simple, slight) | |
| unadorned | |
| uncommon(adjective, light, thin, strange, exceptional) | |
| uncompleted | |
| unconsummated | |
| unfit | |
| unfulfilled(adjective, incomplete) | |
| ungenerous(adjective, small) | |
| unintelligent(adjective, dull, silly, foolish, stupid) | |
| unperfected | |
| unproductive(slight, poor, inadequate, limited, trivial) | |
| unusual(adjective, light, thin, exceptional, short) | |
| warped(imperfection, broken, incomplete, inexact, defective) | |
| witless(adjective, dull, silly, foolish, stupid) | |
| ESN | |
| abridged | |
| adulterated |
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| APA | Smart Define. (2015). deficient thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/deficient/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "deficient thesaurus" https://smartdefine.org/deficient/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, deficient thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/deficient/thesaurus/synonyms>. |
| MLA | Smart Define. "deficient thesaurus" 13 April 2015. Web. 24 September 2026. <https://smartdefine.org/deficient/thesaurus/synonyms> |