Origin: Germanic Old English suffix
Flatness has 6 different meanings across 1 category:
the property of having two dimensions
a want of animation or brilliance
"the almost self-conscious flatness of Hemingway's style"
a deficiency in flavor
"it needed lemon juice to sharpen the flatness of the dried lentils"
the property of having little or no contrast; lacking highlights or gloss
inactivity; showing an unusual lack of energy
"the general appearance of sluggishness alarmed his friends"
The state of being flat