inaccuracy

Short definition from Wiktionary

Noun

1. 1
   The property of being inaccurate; lack of accuracy.
2. 2
   A statement, passage etc. that is inaccurate or false.
3. 3
   Incorrect calibration of a measuring device, or incorrect use; lack of precision.
4. 4
   A move that is considered suboptimal, but not as bad as a mistake or blunder.