-1
traditional
-1
unbelievable
-1
unconvincing
-1
unlikely
-1
unworkable
-1
whilom
-1
yesteryear
-1
yore
-2
begun(adjective, started)
-2
born
-2
bygone
-2
concurred
-2
dubious
-2
erstwhile
-2
ex post facto
-2
fantastic
-2
far-off
-2
frontal
-2
inconceivable
-2
incredible
11 years ago|1.9k views|share |citing 
APASmart Define. (2015). prospective thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/prospective/thesaurus/antonyms
ChicagoSmart Define. 2015. "prospective thesaurus" https://smartdefine.org/prospective/thesaurus/antonyms (accessed September 25, 2026).
HarvardSmart Define 2015, prospective thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/prospective/thesaurus/antonyms>.
MLASmart Define. "prospective thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/prospective/thesaurus/antonyms>