Behaving wrongly in some way, especially by leaving home. (Cambridge Dictionary)
Travelling or given to travelling. (Merriam – Webster)
Straying outside the proper path or bounds. (Merriam – Webster)
Moving about aimlessly or irregularly. (Merriam – Webster)
Behaving wrongly. (Merriam – Webster)
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 partner. (Collins Dictionary)
Erring or straying from the accepted course or standards.
How to deal with errant employees.