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Use "rattier" in a sentence
"I open the door to see him standing at the bars of his crib, sucking his nukie, ratty blanket in one hand, beloved and even rattier Bunny in the other."
"He had a brief glimpse of a scruffy-looking guy with ratty hair and even rattier coat."
"He said they never get new wigs, just keep the old ones as they become rattier and rattier."