1 in bad repair or condition; faded and worn, dingy, dilapidated.
2 dressed in old or worn clothes.
3 of poor quality.
4 contemptible, dishonourable (a shabby trick).
Derivatives:
shabbily adv. shabbiness n. shabbyish adj.
Etymology: shab scab f. OE sceabb f. ON, rel. to SCAB
Useful english dictionary. 2012.