1. superficially plausible but actually wrong or misleading

Examples

• The politician’s specious argument sounded convincing but was based on false data.
• Her specious reasoning fooled many people at first.
• The company’s specious claims about their product were eventually exposed.
• He presented a specious justification for his actions.
• The lawyer’s specious logic failed to persuade the jury.
• Critics called the theory specious and unsupported by evidence.