ungentlemanly

It would seem ungenerous and ungentlemanly to rehash the arguments in favor of scenario No. 1.

Bogey no sooner saw him there than he hammered into the Turk's figure-head in the most violent and ungentlemanly way.

Through this latter most ungentlemanly practice, the ruin which I had predicted to Toby Dammit overtook him at last.

I believe you are treating me in a most ungentlemanly manner in keeping me here when I don't wish to stay.

Well, yes; you see, the Committee found out that she'd been guilty of ungentlemanly conduct.

To use phrases which admit of a double meaning is ungentlemanly, and, if addressed to a lady, they become positively insulting.