stranger

A person whom one does not know; a person who is neither a friend nor an acquaintance.

That gentleman is a stranger to me.

Children are taught not to talk to strangers.

An outsider or foreigner.

I am a most poor woman and a stranger, / Born out of your dominions.

Melons on beds of ice are taught to bear, / And strangers to the sun yet ripen here.

One not admitted to communion or fellowship.

A newcomer.

[…] St. Bede's at this period of its history was perhaps the poorest and most miserable parish in the East End of London. Close-packed, crushed by the buttressed height of the railway viaduct, rendered airless by huge walls of factories, it at once banished lively interest from a stranger's mind and left only a dull oppression of the spirit.

The first thing that strikes the stranger is the sharpness of the curves on the metre gauge; it is not unusual for a long train to be travelling in three directions at once, and the engine is frequently in full view of the windows of the ninth or tenth carriage.

Used ironically to refer to a person who the speaker knows.

Hello, stranger!

To estrange; to alienate.

Dowered with our curse, and strangered with our oath