unsporting

It was excusable, if unsporting, for the scout to bite the thumb of his nearest assailant—and a good thorough bite it was.

It seemed to him that he had taken a rather mean and unsporting line, nor did he believe for a moment that he was honest.

"Too unsporting," growled the beefy squire, his pale eyes squinting with strain.

It was unsporting, however, to go in confident of defeat, so she meant to do her best.