“不能达成一致意见”常见的英文表达有：
fail to reach a consensus
“fail to”表示“未能”，“reach a consensus”意思是“达成共识”，整体表达就是“不能达成一致意见”。
例句：Despite hours of discussion, the team members still failed to reach a consensus on the project plan.（尽管讨论了数小时，团队成员仍然不能就项目计划达成一致意见。）
be unable to come to an agreement
“be unable to”意思是“不能”，“come to an agreement”表示“达成协议”，此表达较为口语化和常用。
例句：The two parties were unable to come to an agreement on the price, so the negotiation broke down.（双方在价格问题上不能达成一致意见，所以谈判破裂了。）
not be able to arrive at a unanimous decision
“arrive at a decision”表示“做出决定”，“unanimous”意思是“一致的，全体同意的”，该表达强调不能做出全体一致的决定。
例句：Due to different viewpoints, the committee members were not able to arrive at a unanimous decision.（由于观点不同，委员会成员不能达成一致意见。）