1. the quality of being superficially plausible but actually wrong or deceptive
Usage: formal; rare

Examples

• The speciosity of his argument became apparent under careful examination.
• Despite its initial appeal, the theory’s speciosity was revealed through rigorous testing.
• The lawyer warned against the speciosity of the opposing counsel’s claims.
• Her presentation had a certain speciosity that masked its fundamental flaws.
• The speciosity of the advertisement’s promises led to consumer complaints.