Definition of dirty
vile; despicable; "a
dirty (or lousy) trick"; "a filthy traitor"
contaminated with infecting organisms; "dirty wounds"; "obliged to go into
infected rooms"- Jane Austen
(of color) discolored by impurities; not
bright and clear; "dirty" is
often used in combination; "a
dirty (or dingy) white"; "the muddied
grey of the sea"; "muddy colors"; "dirty-green walls"; "dirty-blonde hair"
(of a manuscript) defaced with changes; "foul (or dirty) copy"
violating
accepted standards or rules; "a
dirty fighter"; "used
foul means to
gain power"; "a
nasty unsporting serve"; "fined for unsportsmanlike behavior"