99 entries under great topic. ×

26
incredible(adjective, excellent, flat, poor)
26
unbelievable(adjective, excellent, flat, poor)
22
implausible(adjective, slight, flat, poor)
16
unthinkable(adjective, excellent, unusual, superb)
14
inconceivable(adjective, flat, poor, thin)
14
marvelous(adjective, hard, excellent, superb)
14
unconvincing(adjective, flat, poor, thin)
14
unimaginable(adjective, excellent, superb, super)
12
splendid(excellent, superb, super, groovy)
11
extraordinary(excellent, strange, superb, super)
10
fantastic(adjective, excellent, extraordinary, strange)
10
weak(adjective, poor, extraordinary, strange)
10
fabulous(excellent, superb, super, groovy)
9
fanciful(adjective, excellent, superb, super)
9
wonderful(adjective, excellent, superb, super)
8
thin(adjective, weak, poor, extraordinary)
6
appealing(excellent, superb, super, groovy)
6
charming(excellent, superb, super, groovy)
6
lovely(excellent, superb, super, groovy)
6
amazing(excellent, extraordinary, superb, super)
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APASmart Define. (2015). improbable thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/improbable/thesaurus/synonyms
ChicagoSmart Define. 2015. "improbable thesaurus" https://smartdefine.org/improbable/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, improbable thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/improbable/thesaurus/synonyms>.
MLASmart Define. "improbable thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/improbable/thesaurus/synonyms>