Specious/ˈspiːʃəs/ Definition 1 of 1Pro Tip 1/3Hidden Flaws Specious things seem right at first, but don't hold up to scrutiny. The plan was specious, falling apart under careful review. Pro Tip 2/3Not Trustworthy Use 'specious' when something intentionally tries to deceive. His specious smile hid his true intentions. Pro Tip 3/3Critique Tool 'Specious' is often used to criticize arguments or ideas. Her specious claims were quickly disproved in the debate.