Meanings of decided hostility in English

There was even decided hostility in Ryder's reply.

Hitherto Mr. Peel had acted with moderation and urbanity, but he now gave indications of decided hostility.

Before many days had elapsed, the decided hostility of his brother's manner could no longer escape his attention.

I have perceived marks of decided hostility towards myself, in a recent number of the American Art Union Bulletins.

Ominous as such a commencement would have been under any other circumstances, Julian was so prepared for more decided hostility, that he was even hopeful.