3 adjectives to describe corrugations

I had already torn off my mittens, and as I slid at last over a rough place in the ice I succeeded in getting my finger-nails into the little corrugations of the surface and in stopping my perilous drift; but I hardly dared breathe lest I should lose my hold.

The DUMMY CARTRIDGE is tin plated and the shell is provided with six longitudinal corrugations and three circular holes.

Otherwise it might be true that the restless and inquisitive climate of the Atlantic coast, which wears the ordinary Yankee to leanness, and "establishes a raw" upon the nervous system, does soften to acuteness, mobility, and racy corrugation in the breast of its natural ally, the Doctor.

3 adjectives to describe  corrugations