From The Collaborative International Dictionary of English v.0.48:
Dingy \Din"gy\ (d[i^]n"j[y^]), a. [Compar. Dingier; superl.
Dingiest.] [Prob. fr. dung. Cf. Dungy.]
Soiled; sullied; of a dark or dusky color; dark brown; dirty.
"Scraps of dingy paper." --Macaulay.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Dingey \Din"gey\, Dingy \Din"gy\, Dinghy \Din"ghy\, n. [Bengalee
dingi.]
1. a small boat propelled by oars or sails, used in the East
Indies, in sheltered waters. [Written also dinghey.]
--Malcom.
[1913 Webster]
2. a small boat intended to be used as a tender or lifeboat,
carried or towed by a ship. It may be propelled by oars,
sail, or a motor.
[PJC]
3. a small boat of shallow draft with cross thwarts for seats
and rowlocks for oars with which it is propelled.
Syn: dory, rowboat.
[WordNet 1.5]