flatness

noun

1. 1

   The state of being flat

2. 2

   The state of being two-dimensional; planar : planarity

3. 3

   The state of being bland : dullness

4. 4

   Mattness, the quality of a painted surface which scatters or absorbs the light falling on it, so as to be substantially free from gloss or sheen

5. 5

   Lack of bouquet and freshness of a wine, through too much aeration or infection with film yeasts

6. 6

   Slim-tailedness or platykurticity