inaccuracy

in- 'un-, not' + accuracy (from Latin accuratus, from the past participle of accurare "to take care of", itself from ad- "to" + curate "take care of" (from cura "care, concern, trouble", from a Proto-Indo-European base *kois- "to be concerned"))

inaccuracy (countable and uncountable, plural inaccuracies)

1. (uncountable) The property of being inaccurate; lack of accuracy.
2. (countable) A statement, passage etc. that is inaccurate or false.
   • 1922, Herbert Earl Wilson, The Lore and the Lure of the Yosemite Indians‎:

     This book has a few factual inaccuracies, but only because of the limits of contemporary knowledge. For instance, at the time of writing, Ribbon Falls was thought to be the highest waterfall in the world; today we know that Angel Falls in Venezuela has this distinction.

3. (uncountable) Incorrect calibration of a measuring device, or incorrect use; lack of precision.

• (property) imprecision, incorrectness, inexactness
• (inaccurate/false statement etc.) error, mistake, fault

• accuracy

• inaccurate
• inaccurately