ADJ [ADJ n]行为不当的;出轨的;出格的Errant is used to describe someone whose actions are considered unacceptable or wrong by other people. For example, an errant husband is unfaithful to his wife. 行为不当的;出轨的;出格的 [formal]
Usually his cases involved errant husbands and wandering wives.
通常他接的案子都涉及出轨的丈夫和离家出走的妻子。
His errant son at Dartmouth ran up debts of £250m.