Vagarious (adj) (rare)
Erratic and unpredictable in behaviour or direction.
Late 18thC, from the sense of changing, inconstant ‘vagary’.
“It was hard to keep up with his vagarious behaviour.”
“The vagarious regime was tiresome.”
Itinerant (adj) (noun)
Travelling from place to place. / A person who travels from place to place.
Late 16th century (used to describe a judge travelling on a circuit): from late Latin itinerant- ‘travelling’, from the verb itinerari, from Latin iter, itiner- ‘journey, road’.