(dustier, dustiest)
1.
If places, roads, or other things outside are ~, they are covered with tiny bits of earth or sand, usually because it has not rained for a long time.
They started strolling down the ~ road in the moonlight.
ADJ: usu ADJ n
2.
If a room, house, or object is ~, it is covered with very small pieces of dirt.
...a ~ attic...
ADJ