One who wanders aimlessly, who roams, who travels at a lounging pace.(noun)
An idler, a loafer.(noun)
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Use "flaneur" in a sentence
"He was called a flaneur, one who strolled the arcades."
"The flaneur is a stroller, a loiterer, someone who ambles through a city without apparent purpose but is secretly attuned to the history of the place and in covert search of adventure and knowledge."
"The flaneur is a multilayered palimpsest that allows us to move from real products of modernity to a critical appreciation of the state of modernity and its erosion into the past."