FIG. 1 is a perspective view of the slip-resistant footwear outsole showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is an enlarged and partial front elevational detail view of a grouping of the elements repeated throughout portions of the footwear outsole as seen in FIG. 2.

FIG. 8 is a perspective view thereof; and,

FIG. 9 is a side elevational view thereof.

The broken lines in FIGS. 1 through 6 depict portions of the footwear outsole that form no part of the claimed design. The broken lines of FIG. 7, 8, and 9 define the perimeter boundaries of the partial views, and also form no part of the claimed design.