“无规律”的英语可以翻译为：disorder ...

他饮食无规律，慢慢消瘦了下去。He was eating irregularly, steadily losing weight.几棵翠绿的枝条无规律地长在周围.A few green branches reached down a little disorderly at the side.分子的无规律运动在高温时比在低温时更激烈.At a high temperature the random molecular motion is...