Examples from the Web for well-hidden
Lesson: To win the presidency, a candidate needs to have fire in the belly; he just needs to keep it well-hidden.
In winter he sleeps just as Buster does, usually in a well-hidden cave.The Burgess Animal Book for Children|Thornton W. Burgess
Every man and boy who could shoulder a gun was in the well-hidden firing lines.The adventures of Kimble Bent|James Cowan
The ventilator was well-hidden and inaccessible to any one without a step-ladder.Whispering Wires|Henry Leverage
No vague, faint suggestion of the well-hidden lair of the moonshiners did the wild covert show forth.The Moonshiners At Hoho-Hebee Falls|Charles Egbert Craddock (AKA Mary Noailles Murfree)
But I am securely fastened now by my well-hidden rope—you don't get ME out in the road there!The Yellow Wallpaper|Charlotte Perkins Gilman