unevenness

noun3

1. •
   The quality or characteristic of being uneven; irregularity; inconsistency; the lack of smoothness or continuity.

   • The unevenness of his voice betrayed his nervousness.
2. •
   The result or product of being uneven.
3. •
   A rough or uneven thing.

   • His chinne, a thorny hairy unevennesse, / Doth threaten, and some daily change possesse. — 1633