If you describe something as unwarranted, you are critical of it because there is no need or reason for it.
例句
Any attempt to discuss the issue of human rights was rejected as an unwarranted interference in the country's internal affairs...任何讨论人权问题的尝试都会被以无端干预该国内政为由加以拒绝。He accused the police of using unwarranted brutality.他指控警方无端施暴。
英汉词典释义
adj.
没有根据的, 无正当理由的
I think it is a totally unwarranted waste of public money.我认为这是毫无正当理由地浪费公款。Such strong criticism was completely unwarranted.这样猛烈的批评完全没有必要。