characterized by plundering or pillaging or marauding; "bands of marauding Indians"; "predatory warfare"; "a raiding party
If you talk about marauding groups of people or animals, you mean they are unpleasant and dangerous, because they wander around looking for opportunities to steal or kill. Marauding gangs of armed men have been looting food relief supplies. a marauding person or animal moves around looking for something to destroy or kill (marauder, from maraud )