| dirt | (adjective) (of roads) not leveled or drained; unsuitable for all year travel | Synonyms: ungraded |
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| dirty | (adjective) soiled or likely to soil with dirt or grime | Synonyms: soiled, unclean |
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| (adjective) (of behavior or especially language) characterized by obscenity or indecency | - |
| (adjective) spreading pollution or contamination; especially radioactive contamination | Synonyms: contaminating |
| (adjective) unethical or dishonest | Synonyms: shoddy, sordid |
| (adjective) expressing or revealing hostility or dislike | - |
| (adjective) obtained illegally or by improper means | Synonyms: ill-gotten |
| (adjective) (of a manuscript) defaced with changes | Synonyms: foul, marked-up |
| (adjective) (of color) discolored by impurities; not bright and clear | Synonyms: dingy, muddied, muddy |
| (adjective) vile; despicable | Synonyms: filthy, lousy |
| (adjective) contaminated with infecting organisms | Synonyms: pestiferous |
| (adjective) unpleasantly stormy | - |
| (adjective) violating accepted standards or rules | Synonyms: cheating, foul, unsporting, unsportsmanlike |