oscuro

Example:The forest was dark, and the trees were dense.

Definition:Not allowing much light to pass through; not light

Example:We sat in the shady spots of the garden for refreshment.

Definition:Providing shade; also : subject to shade or the shadow of a large object especially a tree

Example:The students were confused by the obscure explanation of the theory.

Definition:Indistinct to the eye; difficult to distinguish, recognize, or understand