1.Definition: having no fixed course

"His life followed a wandering course"

Related Adjective(s):erratic, planetary

2.Definition: migratory

"Wandering tribes"

Related Adjective(s):mobile, nomadic, peregrine, roving

3.Definition: of a path e.g.

"The river followed its wandering course"

Related Adjective(s):meandering, rambling, winding