The phrase "more evidential" implies a need for stronger evidence. Synonyms for this phrase include: more conclusive, more probative, more convincing, more reliable, more substantial and more authoritative. These synonyms all convey a sense of increased weightiness and credibility in the evidence presented. The use of these words can help make a statement more compelling and persuasive. When presenting an argument or making a case, it is important to use language that is clear and impactful. Using synonyms for "more evidential" can help add variety and depth to your language while also making your point more convincing.