What does dirty mean?
Dirty is one of English's most versatile everyday words, describing anything soiled with dirt — from muddy shoes to stained laundry — as well as extending into rich figurative territory. When applied to people's behaviour, it signals dishonesty or unfairness, as in a "dirty trick" or "playing dirty." It can describe content that is obscene or sexually explicit, such as a dirty joke, or money obtained illegally. In British English it may even characterise stormy weather. The word functions primarily as an adjective but also serves as a verb meaning to make something unclean, and it derives naturally from the noun dirt, itself rooted in Old English. Its derivatives include dirtily and dirtiness. Because it spans literal cleanliness, moral judgment, and social propriety, dirty carries considerable connotative weight: describing a room as dirty is factual, while calling a person's tactics dirty is a serious accusation. Its frequency, flexibility, and expressive range make it essential vocabulary across registers.
Covered or marked with dirt; not clean.
"His white shirt was dirty after working in the garden."
Also used figuratively for unfair, obscene, or immoral things.
To make something dirty; to stain or soil.
"Be careful not to dirty the new tablecloth."
Transitive use is more common than intransitive.
"Dirty" began life as an adjective formed from the Old English noun "dirt" — but for centuries it also meant muddy in the sense of covered in excrement, which is why calling someone's work "dirty" carried far more sting than it does today.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of dirty
Dirty is formed from the noun dirt plus the suffix -y, first attested in English around the late 15th century. Dirt itself comes from Middle English drit, likely from Old Norse, related to words meaning excrement or filth. The adjective quickly broadened beyond physical soiling to moral and figurative uncleanliness. Related Germanic cognates include Dutch and Low German terms for filth, reflecting its North Germanic origins rather than Latin roots.
Related word forms
How dirty is actually used
Highly common and neutral-to-negative in register; works in both formal and informal contexts. Figurative senses (unfair, obscene) are idiomatic and very frequent in journalism and speech. As a verb, "to dirty" is somewhat less common than adjectival use.
Easily confused with dirty
Dingy describes something faded, shabby, or gloomy in appearance, while dirty specifically means soiled with dirt or unclean.