The ornamental design for an adjustablepillow, as shown and described.
FIG. 1 is a top perspective view of the adjustable pillow in the flat orientation;
FIG. 2 is a bottom perspective view of the adjustable pillow;
FIG. 3 is a top view of the adjustable pillow;
FIG. 4 is a bottom view of the adjustable pillow;
FIG. 5 is a front view of the adjustable pillow;
FIG. 6 is a back view of the adjustable pillow;
FIG. 7 is a side view of the adjustable pillow;
FIG. 8 is a side view of the adjustable pillow;
FIG. 9 is an exploded perspective view of the adjustable pillow in an alternate configuration; and,
FIG. 10 is an exploded top view of the adjustable pillow in an alternate configuration.
The broken lines shown in the drawings are included for the purpose of illustrating portions of the adjustable pillow and forms no part of the claimed design.