The ornamental design for a adjustable freeweight, as shown and described.
FIG. 1 is a front-top-left perspective view of a adjustable free weight showing my design;
FIG. 2 is a rear-bottom-right perspective view thereof;
FIG. 3 is a front side view thereof, the rear side being a mirror image;
FIG. 4 is a right side view thereof, the left side being a mirror image; and,
FIG. 5 is a top elevational view thereof, the bottom elevational view being a mirror image.
The broken line showing the adjustable free weight in FIG. 1, FIG. 2, and FIG. 4 are included for the purpose of showing environmental structure of a pair of holes and form no part of the claimed design.