WordWeb Online

1. The property of having two dimensions
   - two-dimensionality, planeness
    
2. A want of animation or brilliance
   "the almost self-conscious flatness of Hemingway's style"
    
3. A deficiency in flavour
   "it needed lemon juice to sharpen the flatness of the dried lentils"
    
4. The property of having little or no contrast; lacking highlights or gloss
   - lusterlessness [N. Amer], lustrelessness [Brit, Cdn], mat, matt, matte
    
5. Inactivity; showing an unusual lack of energy
   "the general appearance of flatness alarmed his friends";
   - languor, lethargy, sluggishness, phlegm

Type of: dimensionality, dullness, expressive style, gustatory perception, gustatory sensation, inactiveness, inactivity, inertia, style, taste, taste perception, taste sensation

Encyclopedia: Flatness