furrowed

Something that's furrowed has long grooves or indentations in its surface. A newly-planted corn field is furrowed, lined with concave rows. If you are worried, your brow might look furrowed as well.

The sea's surface appears furrowed sometimes, with indentations marking it, and earth that's been prepared for planting neat lines of tulips is also furrowed. The most commonly furrowed thing, however, is a person's forehead or brow: "His furrowed brow stopped me from interrupting him as he read." To furrow is to plow or mark with grooves, also called furrows. The Old English root is furh, "trench in the earth made by a plow."