2
inconsistent
2
inconstant
2
indecisive(adjective, uncertain, indefinite)
2
indistinct(adjective, obscure, ambiguous)
2
inscrutable
2
misty
2
moot
2
mutable
2
nebulous
2
undependable
2
unfixed
2
unsettled
2
unsteady
2
vagabond
2
visceral
2
volatile
1
erroneous
1
fuzzy
1
incredulous
1
negotiable
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APASmart Define. (2016). certain thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/certain/thesaurus/antonyms
ChicagoSmart Define. 2016. "certain thesaurus" https://smartdefine.org/certain/thesaurus/antonyms (accessed September 23, 2026).
HarvardSmart Define 2016, certain thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/certain/thesaurus/antonyms>.
MLASmart Define. "certain thesaurus" 31 March 2016. Web. 23 September 2026. <https://smartdefine.org/certain/thesaurus/antonyms>