1. Voice reason as "to use logic and rational thinking":
* Opposite: Act impulsively, emotionally, or irrationally. This could involve ignoring logic, acting on instinct, or making decisions based on feelings rather than facts.
2. Voice reason as "to express a rational argument":
* Opposite: Remain silent, refuse to engage, or express an illogical argument. This could mean not offering your perspective, choosing to stay quiet even when a logical argument is needed, or presenting a viewpoint that lacks reason or evidence.
3. Voice reason as "to speak with authority and credibility":
* Opposite: Speak with uncertainty, lack of confidence, or with a lack of credibility. This could mean hesitating, not taking a stand, or presenting information in a way that undermines your trustworthiness.
To get a more precise opposite, please provide context. For example, are you talking about:
* A person's tendency to make decisions?
* A specific communication style?
* A specific situation?
Understanding the context will help determine the most fitting opposite to "voice reason."