What is "unapprised"

Usage examples of "unapprised".

I want no family of any respectability to sleep unapprised by the time we go to the binders.

Indeed, it is a fact scarce credible That so mysteriously in his own breast Did this adventurer lock the scheme he planned, That his companion Bertrand, chief in trust, Was unapprised thereof until the hour In which the order to embark was given!

But, as the rear-guard had been captured without firing a shot, their commander was unapprised of their fate, and unprepared for immediate defence.