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the property of having two dimensions
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a want of animation or brilliance;
"the almost self-conscious flatness of Hemingway's style"
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a deficiency in flavor;
"it needed lemon juice to sharpen the flatness of the dried lentils"
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the property of having little or no contrast; lacking highlights or gloss
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inactivity; showing an unusual lack of energy;
"the general appearance of sluggishness alarmed his friends"