Pale, anemic, bloodless are comparable in their extended senses when they are applied to things and mean weak and thin in substance or in vital qualities, as though drained of blood.
Pale stresses deficiency in qualities necessary to give a thing its true color or character. Sometimes it connotes lack of vigor, force, or energy, but more often it implies inadequacy or failure to measure up to the requirements of a type or standard.
Anemic in its extended applications to things implies deficiency in the elements that make for vigor or richness, especially intellectual or spiritual vigor or richness.
Bloodless stresses the absence of qualities necessary to life or lifelikeness (as vitality, warmth, color, and human emotion).