What is "unimpressible"

Usage examples of "unimpressible".

Even had there been no bitter recollections, nor any hostile interest now at stake between them, the mere natural repugnance of the more sensitive system to the massive, weighty, and unimpressible one, must, in itself, have been disastrous to the former.

But when the day is done, even the most unimpressible must yield to the dreamy influences of this tranquil starlight.

I was sure that I had seen her before, looking down from the balcony of a villa just beyond the Roman wall, for the face was not one that even the most unimpressible idler would forget.