adj. 1) Derogatory term for low-tech (paper & pencil, walking, etc.) 2) Any traceable illegal item. 3) Contaminated.

soiled or likely to soil with dirt or grime; "dirty unswept sidewalks"; "a child in dirty overalls"; "dirty slums"; "piles of dirty dishes"; "put his dirty feet on the clean sheet"; "wore an unclean shirt"; "mining is a dirty job"; "Cinderella did the dirty work while her sisters preened themselves"

spreading pollution or contamination; especially radioactive contamination; "the air near the foundry was always dirty"; "the air near the foundry was always dirty"; "a dirty bomb releases enormous amounts of long-lived radioactive fallout"

contaminated with infecting organisms; "dirty wounds"; "obliged to go into infected rooms"- Jane Austen

Defiled with dirt; foul; nasty; filthy; not clean or pure; serving to defile; as, dirty hands; dirty water; a dirty white.

To foul; to make filthy; to soil; as, to dirty the clothes or hands.

make soiled, filthy, or dirty; "don't soil your clothes when you play outside!"

vile; despicable; "a dirty (or lousy) trick"; "a filthy traitor"

A dirty martini has a little bit of olive brine added to the concoction.

Containing appreciable amounts of clay and shale of different material from the host rock. Such material may decrease permeability and effective porosity of the rock. Compare clean.

Not clean. A filesystem is dirty if it is in use or if there is no guarantee that the file system structure is static.

The total price of bonds which includes accrued interest (c.f. clean).