There was this strange unspoken code that you never asked about each other's crimes.

He was too aware of their failings to accept their unspoken codes as his own.

He might have been being polite, careful not to violate the unspoken code to not question decisions made by opponents.

I've followed that unspoken code, too; we haven't been all three together since the water hole.

"You walk into the market with friends, and then - it's an unspoken code - everybody disperses like buckshot."

It was more than just self-interest on their part; she understood the unspoken code they were insisting upon.

It was an unspoken code among them that they did not bring family into their private business, which largely consisted of staying alive in Spooksville.

Always they'd held to their own unspoken, strict code of ethics.

There was an unspoken code among the people of squalor, an implied brotherhood.

So much of my "normal" behavior was based on a complex unspoken code of sexual etiquette.