unmistakable sign

That is such an unmistakable sign of a loafer, that one can hardly imagine a well-bred man doing such a thing.

White globes of cloud showed here and there, and Denman knew them for the unmistakable sign of the trade winds.

He then invited the visitors, in unmistakable sign language, to accompany him as guests of honor, but Seaton refused.

The first unmistakable sign of his hostility came in June 1622, when he interfered with the election of their treasurer.

The novel, especially in its last pages, moves with an intensity that is an unmistakable sign of power.