1. (

• two-dimensionality ,
• flatness ,
• planeness

) the property of having two dimensions ;

2. (

• flatness

) a want of animation or brilliance; "the almost self-conscious flatness of Hemingway's style" ;

3. (

• flatness

) a deficiency in flavor; "it needed lemon juice to sharpen the flatness of the dried lentils" ;

4. (

• flatness ,
• lusterlessness ,
• lustrelessness ,
• mat ,
• matt ,
• matte

) the property of having little or no contrast; lacking highlights or gloss ;

5. (

• languor ,
• lethargy ,
• sluggishness ,
• phlegm ,
• flatness ,

) inactivity; showing an unusual lack of energy; "the general appearance of sluggishness alarmed his friends" ;