"unfamiliar visitor" is a correct and usable phrase in written English.
It refers to someone who is not known or recognized by the person they are visiting. Example: The elderly couple were surprised to see an unfamiliar visitor knocking on their door, asking for directions to the nearby post office.
Amid this gathering of techie (not to say geeky, because that would be a bit unfair), mostly young, mostly male participants, where plaid flannel is the de rigueur fashion note and Google glasses are the accessory of choice, The Austin American-Statesman feels like an unfamiliar visitor from the distant past.
Nine dogs were about him, sleeping, and burst into a furious chorus of barking as the unfamiliar visitor came in.
Exposing a rat to a social stimulus, such as an unfamiliar visitor rat, caused the intensity of theta rhythms to increase in this network.
Retsina, wine flavored with pine resin, was also drunk, as it still is in Greece today, producing similar reactions from unfamiliar visitors; "To add to our calamity the Greek wine, on account of being mixed with pitch, resin, and plaster was to us undrinkable," complained Liutprand of Cremona, who was the ambassador sent to Constantinople in 968 by the German Holy Roman Emperor Otto I.
He tries not to let language restrictions get in the way of his message: When he is unfamiliar with a visitor's language, he resorts to expressive gestures, punctuated by pauses and heavy silences.
It is being used, but the use is of a type unfamiliar to many visitors.
Mr. Holzapfel noted that roads by the state's resort towns were particularly problematic to visitors unfamiliar with the convention.
(Of coure, visitors unfamiliar with the backcountry and its hazards can hire a guide for up to $200 a day).
The evocation of the acts of St. Peter and St. Paul, still obvious to a Western public until the last century, will seem unfamiliar to some visitors.
The National started running these lectures two-and-a-half years ago as a way of drawing in visitors unfamiliar with the history of art, as well as those with some experience.
A handful of independent bookstores do survive, but they all belong to the "second-floor bookshops" category: operating from higher floors of commercial buildings and harder to find for visitors unfamiliar with Hong Kong.
