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| dingy | 
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| a.  darkened with smoke and grime; dirty or discolored The only observation I have is the colors are a bit too gloomy and dingy. | 
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| disagreeable | 
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| a.  not agreeing with tastes or expectations He found the task disagreeable and decided to abandon it. | 
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| discern | 
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| v.  detect; perceive, recognize, or understand something that is not clear I discern in the course of the morning that Thornfield Hall was a changed place. | 
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| discourse | 
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| n.  a formal, lengthy discussion of a subject; verbal exchange; conversation The young Plato was drawn to the Agora to hear the philosophical discourse of Socrates and his followers. | 
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| discrete | 
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| a.  separate; consisting of unconnected distinct parts The universe is composed of discrete bodies. | 
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| discriminating | 
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| a.  able to see differences; showing careful judgment or fine taste A superb interpreter of Picasso was sufficiently discriminating to judge the most complex works of modern art. | 
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| disinfectant | 
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| n.  a substance that kills germs or viruses; agent for removing the causes of infection, as chlorine Then researchers dunk their hands in disinfectant and exit through the chemical shower. | 
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| dislodge | 
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| v.  remove or force out from a position of dwelling previously occupied The prime minister also called for troops to dislodge Mr. president as the country's humanitarian crisis worsens. | 
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| disparage | 
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| v.  belittle;  speak of in a slighting or disrespectful way; reduce in esteem or rank A doting mother, Emma was more likely to praise her son's crude attempts at art than to disparage them. | 
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| disparity | 
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| n.  difference; condition or fact of being unequal, as in age, rank, or degree Their disparity in rank made no difference at all to the prince and Cinderella. | 
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| dispel | 
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| v.  scatter; drive away; cause to vanish The bright sunlight eventually might dispel the morning mist. | 
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| dissident | 
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| a.  disagreeing, especially with a majority; rebellious In the purge that followed the student demonstrations, the government hunted down the dissident students and their supporters. | 
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| dissipate | 
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| v.  spend or expend wastefully; vanish by dispersion; drive away; disperse He is a fine artist, but I fear he may dissipate his gifts if he keeps wasting his time playing games. | 
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| dissipated | 
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| a.  unrestrained by convention or morality; wasteful of health or possessions in pursuit of pleasure I have myself - I tell it you without parable - been a worldly, dissipated, restless man. |