different between inexactness vs imprecision

English

inexact +? -ness

inexactness (usually uncountable, plural inexactnesses)

The characteristic or quality of being inexact; a lack of precision, accuracy, or certainty.
The inexactness of her answers suggested that she had no idea of the real situation.

From im- +? precision.

imprecision (countable and uncountable, plural imprecisions)

imprecision in The Century Dictionary, New York, N.Y.: The Century Co., 1911.
imprecision in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.

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