adj. Showing signs of wear and tear; threadbare or worn-out: shabby furniture. adj. Dilapidated or deteriorated in condition, especially through neglect; seedy: a shabby little park. adj. Wearing threadbare clothing.adj. Despicable; mean: a shabby trick. adj. Not generous or just; unfair: shabby treatment. adj. Of mediocre or substandard quality: a shabby performance.