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Webster 1913 Edition

Adj.

Inaccurate.

Boyle.

Adj.

Inaccurate; not correct or exact. [But inaccurate is now used.]

unaccurate ‎(comparative more unaccurate, superlative most unaccurate)

Not accurate.
I do by no means find fault with such figurative and common ways of speaking, in popular and ordinary Discourses, where unaccurate Thoughts allow unaccurate ways of speaking — John Locke.