She gets 'ratty' [=('chiefly US') 'cranky'] if she doesn't get enough sleep.
Those shoes are getting pretty 'ratty'.
a 'ratty' [='shabby'] old sweater
(..) Peter... I don't know. For so long, I would play it over and over in my head what had I missed, what had I missed. He was just a normal unassuming guy. He wore the same ratty lab coat for years... He took the D train to work, at seven every morning... came home at every night. I don't know. (..)2014 The Amazing Spider-Man 2