Meaning : The property of having two dimensions.
Synonyms : planeness, two-dimensionality
Meaning : A want of animation or brilliance.
Example :
The almost self-conscious flatness of Hemingway's style.
Meaning : A deficiency in flavor.
Example :
It needed lemon juice to sharpen the flatness of the dried lentils.
Meaning : The property of having little or no contrast. Lacking highlights or gloss.
Synonyms : lusterlessness, lustrelessness, mat, matt, matte
Meaning : Inactivity. Showing an unusual lack of energy.
Example :
The general appearance of sluggishness alarmed his friends.
Synonyms : languor, lethargy, phlegm, sluggishness