1. forming an opinion or theory without sufficient evidence; guessing
Usage: present participle of conjecture

Examples

• The scientists were conjecturing about the cause of the unusual weather patterns.
• Without more data, we’re just conjecturing about what happened.
• She spent hours conjecturing why her friend hadn’t called back.
• The detective was conjecturing that the suspect had an accomplice.
• Historians are still conjecturing about the true identity of the anonymous author.
• Stop conjecturing and let’s wait for the official results.