What literary device is unwieldy slow heavy and pale as lead?

The phrase "unwieldy slow heavy and pale as lead" is an example of simile and polysyndeton.

Let's break it down:

* Simile: The phrase compares something to lead, using the word "as." This comparison is meant to evoke the feeling of something being slow, heavy, and lifeless.

* Polysyndeton: This literary device uses multiple conjunctions (in this case, "and") to create a sense of deliberate slowness and weight. The repetition emphasizes the qualities being described, making them seem even more prominent.

Therefore, the phrase uses both simile and polysyndeton to paint a vivid picture of something that is sluggish, cumbersome, and lacking in vitality.