1. making an incorrect assumption or assumption based on false premises; wrongly supposing or believing something to be true
Usage: rare or literary usage; often used in formal or academic contexts

Examples

• The misassuming conclusion led the researchers down an unproductive path.
• His misassuming belief that all politicians were dishonest colored his entire worldview.
• The misassuming premise of the argument was exposed during the debate.
• She made a misassuming judgment about his character based on limited information.