The ornamental design for a kitchenknife, as shown and described.
FIG. 1 is a front elevational view of a kitchen knife showing my new
design, the rear elevational view of a kitchen knife is a mirror image of
the front elevational view;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is an end view of a kitchen knife taken from the right in FIG. 1;
and,
FIG. 5 is an end view a kitchen knife taken from the left in FIG. 1.