His appearance was sufficiently unusual, together with the aristocratic coach, to stop Blake in his tracks.

This is sufficiently unusual - and impressive - to make the "written and directed by" credit seem like an afterthought.

That was sufficiently unusual for the captain to have made special note of it in his report.

This was sufficiently unusual to betray him.

That was sufficiently unusual that he stayed with one of them.

The use of the cognomen alone in the Imperial title is sufficiently unusual to raise questions about the circumstances in which the coins were produced.

It was sufficiently unusual for him to stop momentarily in order to examine the effect.

That in itself is sufficiently unusual.

This case is sufficiently unusual to make me think we should investigate it.

He found he was becoming pleasantly excited: the prospect of MI evenly matched fight against another frigate was sufficiently unusual to be welcome.