We don't have synonyms for provencial yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are provincial, proverbial and provencal.
(adj) :
Archaic form of Provençal. [Of, from or relating to Provence, a traditional geographic region roughly corresponding to the modern administrative region of Provence-Alpes-Côte d'Azur, France.]
(adj) :
Archaic form of Provençal. [Of, from or relating to Provence, a traditional geographic region roughly corresponding to the modern administrative region of Provence-Alpes-Côte d'Azur, France.]