ratty

Concise Oxford English Dictionary © 2008 Oxford University Press:
ratty/ˈrati/

▶adjective (rattier, rattiest)

• 1 resembling or characteristic of a rat.

• 2 infested with rats.

• 3 informal in poor condition; shabby or run-down.

• 4 Brit. informal bad-tempered and irritable.

– derivatives
rattily adverb,
rattiness noun.