The ornamental design for a cuttingboard, as shown and described.
FIG. 1 is a front, left and bottom perspective view of a cutting board, showing my design.
FIG. 2 is a front elevation view thereof.
FIG. 3 is a rear elevation view thereof.
FIG. 4 is a left side elevation view thereof.
FIG. 5 is a right side elevation view thereof.
FIG. 6 is a top plan view thereof.
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a partial enlarged view of an area labeled 8 in FIG. 1 comprising supporting legs.
The broken lines shown in the drawings are included for the purpose of illustrating portions of the cutting board that form no part of the claimed design.