His thumbs were tired and wrinkled and pink, the way they got when he stayed in the bathtub too long. The words wrinkled and pink are examples of.

“Wrinkled” and “pink” describe what the thumbs look and feel like, so they are adjectives. Because these descriptive words help the reader picture the thumbs, they are graphic adjectives. The comparison is the phrase about how the thumbs looked when he stayed in the bathtub too long, not the words “wrinkled” and “pink.”

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