zì xíng wú jì
恣:放纵,无拘束;忌:顾忌,畏惧。形容随意作恶,毫无顾忌
鲁迅《坟·论“费厄泼赖”应该缓行》:“坏人靠着冰山,恣行无忌,一旦失足,忽而乞怜。”
作谓语、定语;指随意作恶
act wilfully and unscrupulously