Meanings of wordless understanding in English

The troupe leader looked over at Sielto, and a wordless understanding passed between them.

In the moment we met, I knew there was a deep, wordless understanding between us.

The hooded attentions of a child, that wordless understanding.

What they had in common was more vital than similar interests-itwas wordless understanding and accord.

After that it seemed as though they were companions in distress, linked by a secret, wordless understanding, and Ann walked on with a lighter heart.

There had arisen between the Frenchman and herself a kind of close, wordless understanding and sympathy which she, at any rate, still called "friendship."