The ornamental design for a bluntarrowhead, as described above and as shown in the accompanying drawings.
FIG. 1 is a front perspective view of a blunt arrow head in accordance with the inventive design;
FIG. 2 is a rear perspective view of a blunt arrow head in accordance with the inventive design;
FIG. 3 is a front elevational view of the blunt arrow head shown in FIG. 1;
FIG. 4 is a rear elevational view of the blunt arrow head shown in FIG. 1; and,
FIG. 5 is a side elevational view of the blunt arrow head shown in FIG. 1, the design being the same viewed from all sides with the exception of the portion of the threads which that is visible, but which threads are hidden in use threaded into the shaft of an arrow.