Final answer:
The antonym for 'veritable' is 'doubtful' or 'questionable,' which describe something as lacking verification and possibly untrue.
Step-by-step explanation:
The antonym for 'veritable' is 'doubtful' or 'questionable.' The word 'veritable' is often used to emphasize that something is true or genuine. In the context of reliability of reports, especially when questioning their veracity as in reports about supernatural encounters, these reports might be labeled as not being veritable if they lack verification and have conceivable natural explanations. In such discussions, one might rebut or present a counter argument regarding the truthfulness or authenticity of these reports. Therefore, the reports in question would be described as 'doubtful' or even 'fabricated' as opposed to being veritable and beyond reproach.