111 entries under adjective topic. ×

19
void(noun, negative, inferior, inadequate)
12
ineffective(inferior, inadequate, useless, unsound)
12
zero(noun, slight, lower, informal)
11
bad(false, unreasonable, unsound, unacceptable)
10
invalid(void, unsound, worthless, unacceptable)
10
null and void(expression, idiom, negative, inferior)
10
useless(weak, slight, lower, value)
9
barren(inadequate, limited, feeble, useless)
9
nothing(noun, slight, lower, value)
8
vain(inferior, inadequate, limited, feeble)
8
worthless(slight, lower, value, inferior)
8
zilch(noun, slight, lower, slang)
7
empty(unsubstantial, nonexistent, unsubstantiality)
6
ineffectual(inferior, inadequate, limited, feeble)
6
inefficacious(inferior, inadequate, feeble, useless)
6
negative(ineffectual, valueless, nothing, nonexistent)
6
nonexistent(real, ineffectual, valueless, fictional)
6
nugatory(slight, lower, value, inferior)
6
vacant(unsubstantial, nonexistent, unsubstantiality)
6
vacuous(unsubstantial, nonexistent, unsubstantiality)
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APASmart Define. (2015). null thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/null/thesaurus/synonyms
ChicagoSmart Define. 2015. "null thesaurus" https://smartdefine.org/null/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, null thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/null/thesaurus/synonyms>.
MLASmart Define. "null thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/null/thesaurus/synonyms>