6
unconvincing
5
defective
4
void(adjective, negative, inferior, useless, meaningless)
4
invalid(adjective, void, unsound, worthless, unacceptable)
4
null(adjective, negative, inferior, inadequate, feeble)
4
groundless
3
erroneous
3
illogical
3
wrong
2
bad(adjective, false, unreasonable, unsound, unacceptable)
2
bland
2
blank
2
revoked
2
white
2
worthless(adjective, weak, inferior, inadequate, feeble)
1
annulled(adjective, invalid, canceled)
1
arid
1
avoided(adjective, meaningless, invalid, unsubstantiated, unsupported)
1
bare
1
barren
11 years ago|1.5k views|share |citing 
APASmart Define. (2015). null and void thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/null_and_void/thesaurus/synonyms
ChicagoSmart Define. 2015. "null and void thesaurus" https://smartdefine.org/null_and_void/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, null and void thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/null_and_void/thesaurus/synonyms>.
MLASmart Define. "null and void thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/null_and_void/thesaurus/synonyms>