There is a tendency for Japanese to want to know a certain amount of personal information about someone such as age, position and whether they are married or not, before they feel comfortable talking with a stranger.

My brother, being yet unmarried, did not keep house, but boarded himself and his apprentices in another family.

The experiment was made on a hundred unmarried males.

I'm a thirty-year-old unmarried woman.

He had a child even though he wasn't married.

For a start, he was the illegitimate son of an unmarried mother.

Tom wasn't married.

I'm unmarried.

Tom and Mary are both unmarried.