flâneur, euse: nm/f. stroller.
savant, e: adj. scholarly, learned; (calé) clever.

"The street conducts the flâneur into a vanished time. For him, every street is precipitous. It leads downward... into a past that can be all the more spellbinding because it is not his own, not private."

-- Walter Benjamin, The Arcades Project

definitions courtesy: Harper Collins French Concise Dictionary