| dire | (adjective) fraught with extreme danger; nearly hopeless | Synonyms: desperate |
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| (adjective) causing fear or dread or terror | Synonyms: awful, direful, dread, dreaded, dreadful, fearful, fearsome, frightening, horrendous, horrific, terrible |
| direct | (adjective) direct in spatial dimensions; proceeding without deviation or interruption; straight and short | - |
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| (adjective) (of a current) flowing in one direction only | - |
| (adjective) straightforward in means or manner or behavior or language or action | - |
| (adjective) similar in nature or effect or relation to another quantity | - |
| (adjective) in a straight unbroken line of descent from parent to child | Synonyms: lineal |
| (adjective) moving from west to east on the celestial sphere; or--for planets--around the sun in the same direction as the Earth | - |
| (adjective) lacking compromising or mitigating elements | Synonyms: exact |
| (adjective) in precisely the same words used by a writer or speaker | Synonyms: verbatim |
| (adjective) having no intervening persons, agents, conditions | Synonyms: unmediated |
| (adjective) being an immediate result or consequence | - |
| directed | (adjective) manageable by a supervising agent | - |
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| (adjective) (often used in combination) having a specified direction | - |
| directing | (adjective) showing the way by conducting or leading; imposing direction on | Synonyms: directional, directive, guiding |
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| directional | (adjective) relating to or indicating directions in space | - |
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| (adjective) relating to direction toward a (nonspatial) goal | - |
| (adjective) showing the way by conducting or leading; imposing direction on | Synonyms: directing, directive, guiding |
| directionless | (adjective) aimlessly drifting | Synonyms: adrift, afloat, aimless, planless, rudderless, undirected |
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| directive | (adjective) showing the way by conducting or leading; imposing direction on | Synonyms: directing, directional, guiding |
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| direful | (adjective) causing fear or dread or terror | Synonyms: awful, dire, dread, dreaded, dreadful, fearful, fearsome, frightening, horrendous, horrific, terrible |
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| dirigible | (adjective) capable of being steered or directed | Synonyms: steerable |
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| 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 |