Final answer:
A synonym for 'no proof that he is the wrongdoer' is 'No evidence of wrongdoing'.
Step-by-step explanation:
A synonym for the phrase 'no proof that he is the wrongdoer' is No evidence of wrongdoing. This phrase suggests that there is a lack of evidence or proof to establish guilt. It implies that there is no concrete evidence to support the claim that he is the wrongdoer.