Synonyms|1.7kAntonyms|642|Broader|15Narrower|44Related|2.1k
1
shady
1
suspect
1
temperamental
1
theoretical(adjective, hypothetical)
1
touch-and-go(adjective, risky)
1
unconfident(adjective, calm, quiet)
1
unconfirmed
1
unconvinced
1
unconvincing
1
undefined
1
undetermined
1
unlikely
1
unresolved(adjective, uncertain, settled)
1
unsafe(adjective, strong, secure)
1
unsound(strong, sound, well)
1
unspecified
1
unsubstantiated
1
up in the air(expression, adjective, idiom, uncertain)
1
vacillating
1
variable
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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>