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No one admitted to being more than a casual acquaintance.

He seemed to recall some casual acquaintance saying something recently about market gardening.

It might have been just a lovely meeting of Americans in a foreign country, where even casual acquaintances could suddenly become best friends.

You may have known someone else for twenty years and yet he will never be more than a casual acquaintance.

From his tone he might have been talking of a treatment applied to some casual acquaintance.

Two years since we've seen each other, and we're talking as if there had never been more between us than casual acquaintance.

I didn't want casual acquaintances getting nervous because of my contact with him.

I had formed a casual acquaintance with him, and he sat down at our table.

So it's fair to say some of my more casual acquaintances were surprised by the move.

When I first made a casual acquaintance with him he was a bachelor.