Home › Words › S › suppositiousnesssuppositiousnesssuppositiousness means the state or condition of being suppositious.Among words judged in Lexicurio's Arena, suppositiousness ranks #2,160 of 42,762 for Qualifying.EtymologyFrom suppositious + -ness.nounThe state or condition of being suppositious.Definitions & examples from Wiktionary (CC BY-SA 3.0).