The property of being shabby.

plural of shabbiness

(of clothing) Torn or worn; unkempt. / (of a person) Wearing ragged, very worn, or dirty clothing. / Mean; despicable. / Poor; showing little effort or talent.

(also attributive) A form of interior design where furnishings are either chosen for their appearance of age and signs of wear and tear or where new items are distressed to achieve the appearance of an antique.

Keeping up or affecting an appearance of gentility, though actually shabby.