incog

The straw bonnet—you see people cannot tell whether you are not incog, as yet—'

This Prince had been for some time in France; and tho' he was incog.

Their dress is picturesque; and I have seen the Capitan Pacha, more than once, wearing it as a kind of incog.

Abraham Lincoln, we like to think, was a typical American, but were one to encounter him incog.