| airtight | (adjective) having no weak points | Synonyms: air-tight |
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| (adjective) not allowing air or gas to pass in or out | Synonyms: air-tight, gas-tight |
| 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 |
| flirtatious | (adjective) like a coquette | Synonyms: coquettish |
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| mirthful | (adjective) arousing or provoking laughter | Synonyms: amusing, comic, comical, funny, laughable, risible |
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| (adjective) full of or showing high-spirited merriment | Synonyms: gay, jocund, jolly, jovial, merry |
| mirthless | (adjective) lacking mirth | - |
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| seagirt | (adjective) surrounded or enclosed by the sea | - |
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| shirty | (adjective) (British informal) ill-tempered or annoyed | Synonyms: snorty |
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| skirting | (adjective) being all around the edges; enclosing | Synonyms: encircling |
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| squirting | (adjective) propelled violently in a usually narrow stream | Synonyms: jetting, spouting, spurting |
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| thirteen | (adjective) being one more than twelve | Synonyms: 13, xiii |
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| thirteenth | (adjective) coming next after the twelfth in position | Synonyms: 13th |
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| thirtieth | (adjective) coming next after the twenty-ninth in position | Synonyms: 30th |
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| thirty | (adjective) being ten more than twenty | Synonyms: 30, xxx |
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| virtual | (adjective) existing in essence or effect though not in actual fact | - |
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| (adjective) being actually such in almost every respect | Synonyms: practical |
| virtuoso | (adjective) having or revealing supreme mastery or skill | Synonyms: consummate, masterful, masterly |
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| virtuous | (adjective) morally excellent | - |
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| (adjective) in a state of sexual virginity | Synonyms: pure, vestal, virgin, virginal |