We have no meanings for "certain flatness" in our records yet.
1 Given such extremes, a certain flatness to their performance was to be expected.
2 After they went away things fell into their customary train, and a certain flatness became apparent.
3 But there was a want in her face, a certain flatness of expression which I did not like.
4 With Mrs. Westmore's departure Amherst, for the first time, became aware of a certain flatness in his life.
5 At all events, it was plain that the new policy was suffering from a certain flatness on the further side.
6 Seen from a near view there is a certain flatness of effect and want of light and shade which is, perhaps, slightly unpleasant.
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