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Webster 1828 Edition

, n.

Surface not level; inequality of surface; as the unevenness of ground or of roads.

Turbulence; change; want of uniformity; as the unevenness of king Edward's reign. [Unusual.]

Want of uniformity; as unevenness of temper.

Want of smoothness.

unevenness ‎(countable and uncountable, plural unevennesses)

(uncountable) The quality or characteristic of being uneven; irregularity; inconsistency; the lack of smoothness or continuity.
The unevenness of his voice betrayed his nervousness.
(countable) The result or product of being uneven.
A rough or uneven thing.
- 1633, John Donne, "Sapho to Philænis":
  His chinne, a thorny hairy unevennesse, / Doth threaten, and some daily change possesse.