1) Cardboard type 2) Furrowed 3) Grooved 4) Kind of cardboard 5) Ribbed 6) Uneven 7) Wavy 1) Crinkled 2) Furrowed 3) Ridged 
• (imp. & p. p.) of Corrugate
wrinkled, folded
paper that is rippled or ribbed (goes up and down).
Characteristic of board for boxes made by sandwiching fluted kraft paper between sheets of paper or cardboard.
Folded or shaped into parallel ridges or furrows so as to form a symmetrically wavy surface. 
Folded or shaped into parallel ridges or furrows so as to form a symmetrically wavy surface.
wrinkled, folded
Irregularly folded or wrinkled.
[adj] - shaped into alternating parallel grooves and ridges
corrugated Shaped into alternating parallel grooves and ridges; for example, 'The surface of the ocean was rippled and corrugated.'
As a defect. Alternate ridges and furrows. A series of deep short waves.
adjective shaped into alternating parallel grooves and ridges; `the surface of the ocean was rippled and corrugated`
As a defect. Alternate ridges and furrows. A series of deep short waves.