What prefix signifies 'false'?

The prefix that signifies 'false' is indeed 'pseudo-.' This prefix derives from the Greek word 'pseudes,' which means false or deceitful. It is commonly used in various contexts to indicate something that is pretended, imitative, or not genuinely what it claims to be. For instance, terms like 'pseudonym' (a false name) or 'pseudoscience' (a claim or belief mistakenly regarded as scientific) demonstrate how this prefix conveys the meaning of falsehood or deception.

Other prefixes listed do not relate to the concept of falsehood. The prefix meaning ‘for’ or ‘in favor of’ is ‘pro-,’ while ‘quin-’ refers to five, and ‘pre-’ indicates something that occurs before another event or condition. Thus, 'pseudo-' stands out as the only prefix that directly communicates the sense of falsehood.