caddish

adj

1. Characteristic of a cad, discourteous, ungentlemanly, dishonorable.

   “To introduce into philosophical discussions a sneer at a creed's antiquity is like introducing a sneer at a lady's age. It is caddish because it is irrelevant. The pure modernist is merely a snob; he cannot bear to be a month behind the fashion.”

   “'I think it's absolutely—absolutely caddish of you to mention such things!'”