Significados de icy veneer en inglés

I thought it impossible for someone to break through your icy veneer.

She's tough to crack, but I can tell I am beginning to break through her icy veneer.

Or how about January Jones' frustrated housewife Betty Draper, whose icy veneer masks a woman constantly on the verge of coming undone?

The next day proved stormy, and the driving sleet froze upon the trees and bound their limbs and boughs together with an icy veneer.